The following weapons are used in the video game Counter-Strike Online (also known as Counter-Strike Nexon: Zombies on Steam):
A 2nd generation Glock (retextured model from Counter-Strike) is named "9x19mm Sidearm" in game, it is the spawn weapon of the terrorist faction. As in Counter-Strike, the weapon is sometimes called the “Glock 18”, however the developer has its full-auto mode replaced with a 3-round burst mode instead, as well as the model always lacks the fire selector (possibly on the other side of the weapon) and is incorrectly fed from a 20-round magazine, making it not a genuine Glock 18, but a modified Glock 17. The weapon comes with a red edition and a variant called the "Battle Glock 18C" which can be fired in full-auto by right clicking the secondary fire key. Interestingly, the models of these variants are higher quality than the original weapon, and the markings on their slides were belong to the Glock 18 instead of the Glock 17.
Heckler & Koch USP45 Tactical
The USP returns from Counter-Strike and named "KM .45 Tactical Pistol" in game. It is the spawn pistol for the counter-terrorist faction and comes with a detachable silencer. The skin is taken from Condition Zero which has a strange blue finish. This weapon has two variants, the red editon and the "Battle" edition.
P228 is the same model from Counter-Strike and is called ".228 Compact" in game. Oddly fires .357 SIG rounds.
IMI Desert Eagle Mark XIX
Named "Nighthawk .50 C" in game. Appears as the one of the most powerful sidearm in the game. Its model is almost identical to Counter-Strike Source. The weapon comes with a gold-plated variant, a red edition and an akimbo variant which is only available in Zombie modes.
Named "ES Five-Seven" in game, a weapon exclusive to the counter-terrorists. The model is retextured from Counter-Strike but has a darker finish. As in all the previous Counter-Strike games, the skins of the Five-seveN were base on the original model which is no longer produced.
Beretta 92G Elite II
Named ".40 Dual Elite" in game even the pistols were not chambered in .40 S&W, the .40 caliber variant is the Beretta 96G. Probably a homage to John Woo or Chow Yun Fat. The dual pistols are purchasable by the terrorists, as a equivalent to the CTs’ FN Five-seveN. The model is the same as in Condition Zero.
Named simply "Anaconda" in game and modified to fed with seven .50 AE rounds. Appears as the first revolver in the game.
The Infinity comes with some color variants and three akimbo configurations. Appears as one of the most diverse weapon and considered one of the most accurate pistols in the game. The akimbo variants have secondary firing modes (firing in gangsta stance) which does high rate of fire as the SMGs, although the pistols are relatively inaccurate when firing in bursts. Interestingly, the models showing these weapons have uncocked hammers, which means they couldn't be fired in real-life as the 1911 type pistols are single-action.
Named simply "Luger" in game, it also comes with gold and silver finishes as well as two upgrade variants. It is the most powerful 9mm caliber pistol in the game, but it has low capacity and is not very accurate. It's one of the WW2 classic weapon in the game. The Silver Luger is only available in Zombie Mode 3 and usable by Blair only. It is effective against zombies due to its high knock-back power and higher capacity (15 rounds).
Interestingly, the Luger has the distinction of being the only handgun in the game actually held correctly, rather than using the default "Valve character" stance (also known as teacupping).
A flintlock pistol is featured in the game and it is called “Divine Lock”. With this weapon the player can usually kills an enemy with one shot (except for zombies and monsters) , although its projectile velocity is quite slow and the weapon is very inaccurate due to the lack of riflings, as well as it has lower rate of fire than many “normal” sidearms in the game (firing a shot then reloaded), making it very inconvenient to use in any game modes. The gun is modeled after the "KTW Flintlock Pistol (G.Washington)" airsoft spring pistol (note the “ASGK” marking engraved on the gun), while that replica is based on the British made Hawkins 1748 pistol, implying that the pistol was the personal sidearm of the first US president.
A custom revolver called "Skull-1" appears to be a modified Izhmech MP412. It's a break-frame double-action revolver designed for anti-zombie purposes and available to fire in "sharpshooting mode" or "burst firing mode". The weapon is chambered in .50 Anti-Zombie rounds and has 7 rounds in its cylinder. It features shells auto-ejecting via reloading. There's a akimbo variant called "Skull-2".
AMT Automag V
Named "Automag V" in game. It has lower accuracy and rate of fire than the Desert Eagle, as well as its cheaper. Unlike the real one, the Automag in game is incredibly reliable and it will never jams. Comes with an anti-zombie variant called "Balrog-I", which can fire incendiaries via a pump-action mechanism by using the secondary firing function.
Colt King Cobra
The King Cobra in game is modified to chambered for 7 rounds of .50 AE cartridges, its equipped with a scope. Comes with a gold-plated variant.
Mauser M712 Schnellfeuer
Named "Mauser C96" in game, fires in full auto only, it is fed with a 10 round magazine but oddly fire 9mm rounds.
Named “M1911A1” in game, comes with a 7+1 round magazine.
Called the “M950” in game, semi-automatic and fed with 50 rounds. Come with two upgraded variants.
Called the “M950 Attack” in game, appears as the "upgraded" variant of the M950, it is attached with a usable scope, fed with 58 rounds and can be fires in full-auto.
As the “FNP-45” in game.
Oddly Fire .357 SIG rounds.
Benelli M3 Super 90
The M3 is returned from Counter-Strike and named "Leone 12 Gauge Super" in game. It is the cheapest shotgun in the game and suitable for close-quarter battle. As in all of the previous games, it is only available in pump-action.
Benelli M4 Super 90
The XM1014 (using Condition Zero model) is named "Leone YG1264 Auto Shotgun" in game. It does lower damage but has the highest rate of fire than any other shotguns. Comes with a red edition and a variant called the "Balrog-XI". The Balrog-XI can use Dragon's Breath rounds after the user firing a several rounds.
A fully automatic shotgun with a 20-round drum magazine which available for the terrorists only. Although it’s considered powerful in close range, however it's unstable. Comes with a variant called the "USAS12 Camo". This variant does higher damage, higher rate of fire and has lighter weight, suitable to use in Zombie modes. The Shotgun also has a anti-zombie variant called the "Skull-11". It comes with a 28 round drum mag, a pairs of tactical lights and a un-usable Aimpoint Comp red rot sight. The Skull-11 have two functions, "Buckshot mode" and "Slug mode". When using “Slug mode”, the user could hit targets at longer distances, but the rate of fire will be greatly reduced, turning it to an semi-automatic weapon.
Winchester Model 1887
Named "M1887" in game, possibly a Norinco copy. It is quite useful for hunting zombies thanks to its high knock-back effect. The weapon also comes with a gold-plated variant and two upgrade variants. In game, it can be fed with 8 rounds (or even higher for gold-plated variant). The “M1887 Maverick” is an sawn-off variant of the M1887, it makes the weapon shorter, lighter and has lower capacity (6 rounds), it is belongs to the “pistol” category. Most variants of M1887 in game featuring Terminator 2 style flip-cocking while firing.
Sawed-off Double Barreled Shotgun
An unknown model of sawed-off side by side double barrel shotgun is called “Double-Barrel” (also known as the “DBarrel”) in game. It is powerful although it has the lowest capacity. It's also the weapon which has the highest knock-back effect in the game. There's a variant called the "Quad Barrel". The "Quad Barrel" is a shotgun with four barrels, it's only available in Zombie mode 3 and usable by the heroine only. The Quad Barrel could fire 4 shells each time when the user hold on the secondary fire key. Another variant is called the "Triple Barrel", it shares most performances as the "QuadBarrel" except of the lack of a barrel only. The Triple Barrel is obtainable via upgrape events only.
The Kel-Tec KSG 12 gauge is fed with 15 rounds in game. It's very effective at close range. This shotgun comes with two upgrade variants, a gold-plated variant and a heavily modified version known as the "Thanatos 11".
The SPAS-12 has a several configurations in game. The original model is described as the civilian version. It doesn't featured a buttstock and fires in pump-action only. While its first variant, the "SPAS-12 Deluxe" has a metallic folding stock, it can be fires in either pump-action or semi-automatic. The third variant is called the "SPAS-12 Cobra", it is fitted with a fixed stock and has a laser designator mounted on the weapon's upper receiver. It can be fired in pump-action or semi-automatic. The “SPAS-12 Maverick” is another variant which fed from a 20-round detachable box magazine and available in semi-automatic only, it features a metallic stock which is permanently truss up with a rope.
A Turkish-made bullpup pump-action shotgun is available in the game as the "UTS-15"; it has the highest rate of fire of all pump-action shotguns in-game. It is incorrectly reloaded by placing all the 15 shells in a single tube instead of both tubes. Comes with a few variations and a heavily modified version called the "Janus 11".
Pancor Jackhammer Mk3A1
As the “PJ MK3A1”, 10 round mag.
As the “QBS-09”, fed with 5 rounds.
Named "Schmidt Machine Pistol" in game. It is a low cost sub-machine gun with an integrated suppressor for the counter-terrorists. Model is from Condition Zero. The gun also comes with a variant called the "TMP Dragon" which is only obtainable in the Year of Dragon.
Unlike most of other guns, the MAC-10 retains its name because the company holding the rights to the name went bankrupt. It's the same level as the TMP, as the low cost sub-machine gun for the terrorist faction. The weapon model is from Counter-Strike, it has erroneously shown the gun as a closed-bolt weapon.
Heckler & Koch MP5A5
The MP5 is returned from Counter-Strike (with different front sight) and named "KM Submachine Gun" in game. Appears as an SMG with most balanced performances in the game and is the symbol weapon of many special operations forces. It comes with a "Chinese Year Edition", a gold-plated variant and a "Battle" variant. These variants have higher knock-power than the original weapon. As in Counter-Strike and Condition Zero, the extractor of the weapon is at the wrong side, it shouldn’t be on the same side which the charging handle is located.
Heckler & Koch UMP45
Named "KM UMP45" in game. Appearing to filled the lack of firepower of the MP5. It's a weapon from Counter-Strike. The weapon also comes with a Anti-zombie variant which called the "Skull-3".It is chambered in .45 Anti-Zombie rounds and featured with an 35 round mag, Aimpoint Comp Scope, undetachable suppressor and also can be dual-wielded. Another variant is called the "UMP45 Snake" which can be obtained via special events only. Just like the MP5, the extractor is at the wrong side, it shouldn’t be on the same side which the charging handle is located .
The P90 is returned from Counter-Strike named "ES C90" in game. It has high penetration power, high rate of fire and also high capacity but it does low damage and is expensive. It also comes with a "Chinese Year Edition". The model is the original Counter-Strike P90 with front ripped from Counter-Strike Source model.
Heckler & Koch MP7A1
The MP7A1 appears as the most compact SMG in the game, but is only fed with a 20-round magazine. It can be switches between "A mode" (which changes the firing stance to teacupping, an extremely dangerous way to fire the weapon) and "B mode" (the user will disables the iron sights to installs the Zeiss sight and uses the buttstock and the foregrip to better controls the weapon). In A mode, the rate of fire is extremely high, while in B mode, the rate of fire will be greatly reduced, turning it to an semi-automatic carbine. But at the same time, the accuracy is increased and the scope is usable. The weapon comes with a high-capacity variant called the "MP7A1 60R" which fed with a 40-round magazine (60 rounds in game) and a akimbo variant which only available in Zombie modes.
Auto-Ordnance M1928 Thompson
Named "Thompson Chicago" in game. Also comes with a gold plated variant. It's powerful and has high capacity, also has lower price than many SMGs. It's also one of the WW2 classic weapon in the game but has erroneously shown as a closed-bolt weapon. The gun is also comes with two upgrade variants. The Janus-3 is a heavily-modified variant of the Thompson, it comes with a fake holographic sight, and a M1A1-like charging handle. Interestingly, “Public Enemies” inscriptions can be seen on these weapons’ receivers.
KRISS Vector SMG
Named "Kriss Super V" in game, comes with a unusable holographic sight, a detachable suppressor and an akimbo configuration. Its firepower is equal to the UMP45 and the Thompson. Although it's cheaper, low recoil, accurate and has very high rate of fire. The “Dual Kriss Custom” is the modified version of the dual wielding variant, the weapons were fitted with extended barrels with barrel shrouds and only used by the heroine in Zombie Mode 3.
Heckler & Koch MP5K PDW
The Balrog III is based on the HK MP5K PDW. The model comes with an EO-Tech holographic sight.
Named "MP40" in game. It has an incredibly higher rate of fire than the real one and has erroneously shown as a closed-bolt weapon.
Enfield Sten Mk II
The Sten Mk II retains its name in game. The model has erroneously shown it as a closed-bolt weapon.
Appears as the “Uzi”, also comes with a dual wielded variant.
44 round mag.
Izhmash PP-19 Bizon-2
A 9mm Para variant, fed with 64 rounds. Oddly the user can still cocks and fires the gun when the safety is engaged.
Assault & Battle Rifles
The AK is returned from Counter-Strike and named "CV-47" in game. As the most favourable rifle for the terrorist faction. Just like its real-life counterpart, It's powerful and cheap, but inaccurate when fired fully-automatic. It comes with a gold-plated variant and a "special dragon edition" which can perform tactical reloads. In Zombie Modes gameplay, an high-capacity variant of the AK is also available. It is fed with a 60 round magazine (a U-shaped magazine that never being standard issued in the Soviet/Russian Armed Forces, but in reality, it can hold 100 rounds) , fitted with black furnitures and with Aimpoint Comp scope attached on the rifle’s upper handguard , also it does very high damage against zombies and has higher rate of fire than the original AK.
IMI Galil ARM
The Galil is returned from Counter-Strike and is named "IDF Defender" in game. It has the stats of the 5.56x45mm variant. This weapon is available for the terrorist faction only and is one of the cheapest rifle in the game, performences are fair. The weapon has a Condition Zero model on original Counter-Strike animations. Comes with a variant called the "Battle Galil" which has a correct arc magazine. The “Galil Maverick” is a variant which uses “jungle-style” magazines, it has faster reload speed than any other variants.
GIAT FAMAS F1
Renamed as "Clarion 5.56" in game, it is one of the cheapest rifle for the counter-terrorist faction and a equivalent to the Galil. It's able to fire in 3 round burst, has low recoil and high rate of fire but also low capacity. Retextured model from Counter-Strike. Comes with a variant called the "Battle FAMAS".
SIG SG552 Commando
Named "Krieg 552" in game and available for the terrorist faction only. Appears as one of the assault rifles with the highest rate of fire. Effective in close to middle ranges but has low accuracy due to its unmanageable recoil. It has an original Counter-Strike model with Condition Zero scope.
Steyr AUG A1
Renamed "Bullpup" in game. Available for the counter-terrorist faction. Appears as an assault rifle which equal the SG552. It has high rate of fire and good accuracy. Effect in middle range to long range. It's a weapon from Counter-Strike.
Colt M4A1 Carbine
The M4A1 is returned from Counter-Strike and named "Maverick M4A1 Carbine" in game, comes with variations that all feature a detachable suppressor (except the Camouflaged M4). It is the most favourable rifle for the counter-terrorists and a equivalent to the terrorists’ AK-47. This rifle is accurate, powerful and inexpensive, effective in any ranges. The Camouflaged M4A1 is equipped with a ACOG scope. The gold-plated variant has a foregrip and tactical light installed via railed handguard. The M4A1 Dragon has "speed reloading" feature. Model is ripped from Counter-Strike Source. As in Counter-Strike and Counter-Strike Source, the user will incorrectly chambers the weapon by pulling the forward assist instead of the charging handle. And the dust cover will closed automatically after firing a shot, these errors had also occurred in most of the AR-15 based weapons in the game.
A Korean Carbine classified as SMG in game which available for the counter-terrorist faction only. It has similar firepower and high rate of fire which equal the assault rifles. It can also effect at long range. It has a Dragon painted variant called the "K1ASE" which does higher damage and has better accuracy plus rate of fire. Another variant is called the “K1A Maverick”, it features a foregrip and uses jungle-style magazines.
Heckler & Koch XM8
The XM8 in game can be convert freely between the carbine variant and the sharpshooter variant, as the free-edition rifle for the terrorist faction. It has high rate of fire and light weight, but is slightly inaccurate when firing in bursts. Comes with a usable scope.
The FN SCAR in game can be convert freely between the SCAR-L and the SCAR-H. It's available for the counter-terrorists as a free-edition rifle and is a equivalent to the terrorists’ XM8. The SCAR L has higher rate of fire and accuracy, effect in middle range. The SCAR H is powerful but has a low capacity and heavy weight, mostly effect at close range.
The QBZ-95 is fed with a 75 round drum magazine, appears as the "QBB95" and belongs to the MG class in game. This “MG” has similar features as the assault rifles (although the QBZ-95 itself is already an assault rifle) and also has cheap price. It comes with a high-capacity variant called the "QBB95EX". This variant is fed with 80 rounds and with 400 rounds spare ammo, suitable to use in zombie modes. Another variant is called the "Battle QBB95". It increases the magazine capacity to 100 rounds and has higher rate of fire.
Sage Mk 14 Mod 0 EBR
Named "M14 EBR" in game. Appear as the most powerful "assault rifle" in the game. The rifle is accurate when firing in single, but it's bulky and has low rate of fire plus low capacity. It also comes with an Anti-Zombie sniper rifle variation which called "Skull 5", the rifle fires 5.56 Anti-Zombie round and fed with 24 rounds in “jungle-style” magazines. Another variant which called the "Skull-4" is also based on the EBR. The Skull-4 is an dual-wielded weapon which chambered in 5.56 Anti-Zombie round, with EO-Tech holographic sights installed and fires in semi-automatic only, these rifles were totally fed with 48 rounds. Those anti-zombie variations are possibly modified Ruger Mini-14s with EBR receivers and parts.
Named simply as "F2000 in game. Recoil is low, comes with a zoomable scope.
IMI Tavor TAR-21
Named simply as "TAR-21" in game. Comes with a EO-Tech holographic sight. This rifle has high rate of fire but low recoil, and even has high knock-back power against zombies.
The M16A4 retains its name in game. Painted with desert camo and with foregrip installed. It is only available for the counter-terrorist faction. The weapon is only be able to fire in 3 round burst. Recommended for use in middle range engagements.
The AN-94 retains its name in game and is only available for the terrorist faction, as a equivalent of the M16A4. The weapon's only be able to fire in a fast 2 round burst. It's very accurate and has a better performence than its counterpart, effect in middle ranges. The in-game weapon is poorly modeled as the modeler didn't has its magazine slanted to the right.
Haenel Sturmgewehr 44
The StG44 is available in the game with two upgraded variants and a gold-plated variant. The overall performences are similar to the “CV-47”, as it's very inaccurate when firing in bursts and has lower rate of fire than many modern assault rifles.
The QBZ-95B is an shorten barrel assault rifle of the PLA’s standard issue rifle, the QBZ-95. It is oddly fed with 35 rounds and chambered for 5.56 NATO instead of 5.8 mm (because the weapon itself is derived from the Galil in game). The weapon has high rate of fire but also high recoil, suitable to use in close-quarter battles. It is also the one of the cheapest rifles in game after Galil, which costs about $2,100.
Heckler & Koch HK416
The HK416 retains its name in game and exclusive to the counter-terrorist faction. It comes with a usable suppressor and shares similar performances as the M4A1. Comes with a variant called “Janus-5” which features a foregrip and use Magpul P-MAGs.
Unidentified AKM variant
A version of the AKM (possibly manufactured by some Ex-eastern bloc states) also appears in the game and exclusive to the terrorist faction as a equivalent to the HK416. It is fitted with a synthetic furniture, similar to the post AK-74M models. The weapon seems to have better performances than its elder brother.
Named "L85A2" in game and exclusive to the counter-terrorist faction. Erroneously comes with 3-round burst function.
Named "FN FNC" in game and belongs to the terrorist faction as their equivalent of the L85A2. This rifle has moderate accuracy and a controllable rate of fire.
Called the "M16A1" in game, as a exclusive weapon for the counter-terrorist faction. Comes with a 30 plus 1 round magazine and has selective fire function. The weapon is accurate but is hard to control when firing in bursts, effective in middle ranges. The rifle has a "Expert" variant, which can perform buttstrokes in close-quarter combat. The first person model of the M16A1 (except its variant) has the same animations as the M4A1, implying that it has reused the incorrect drawing and reloading animations as the previous weapon.
Heckler & Koch G36C
The Balrog V is based on the HK G36C, it is fitted with a foregrip, a holographic sight and a tactical light.
Heckler & Koch G11
Named "HK G11" in game and fed with 50 rounds, comes with a fast 3-round burst function.
Named "AK-74U" in game and exclusive to the terrorist faction, its equivalent to the M16A1. The rifle is powerful in close range, but is not effective in longer ranges due to its unmanageable recoil and extremely poor accuracy, recommended for use in cqb only. Oddly, the model shows that the weapon’s safety is on.
Named "ARX-160" in game, fitted with a Leupold Mark 4 CQ/T optical sight and a foregrip.
Springfield M1 Garand
Oddly chambered for 7.62 NATO rounds.
TsKIB SOO OTs-14 "Groza"
Named "Groza" in game.
Silver Shadow Gilboa Shorty
The Gilboa Shorty appears as the “Gilboa Carbine” in the game.
Silver Shadow Gilboa Snake
The Gilboa Snake appears as the “Gilboa Viper”, the upgraded variant of the Gilboa Carbine in the game. Fitted with a pair of laser designators and a red dot sight.
Norinco Type 86S
Oddly fed from a 20-round magazine but has 30-rounds, fires in full-auto.
DIO KH2002 Sama
FN M249-E2 SAW
The SAW is returned from Counter-Strike and retains its name in game. It's suitable used for cover teammates in front line. It comes with a Anti-Zombie variant called the "Skull-7". The Skull-7 is chambered with 120 rounds of 5.56 Anti-Zombie cartridge and equipped with a zoomable M145 machine gun optic. It has its front ripped from CSS model and positioned too high. The weapon also has five more variants: the red edition, camouflaged edition, the "Expert" variant which can perform buttstrokes in close-quarter combat. As well as the "Skull-8", it has a usable axe-type bayonet and fed with 120 rounds of 5.56 Anti-Zombie cartridge. The “Skull-6” is another variant which equipped with a optic.
The MG3 retains its name in game. It is fed from a 200-round ammunition box and is very effective in zombie modes due to its high rate of fire can suppresses a small group of zombies. The user will uses the bipod as a foregrip to better control the weapon when firing it. It also has gold-plated, Christmas special edition and upgraded variants. The “Janus-7” is another heavily modified variant.
GE M134 Minigun
The Handheld GE M134 Minigun is named simply as "M134" in game. Comes with 200 round belt. It has the highest rate of fire than any other MGs (but still far lower than the real Minigun). But the user will have to spent 1.5 seconds to spool up the barrels before firing it. Also, the weapon is extremely heavy, the user’s moving speed will be greatly reduced when firing it. It comes with a modified variant (M134 Predator) which could shorten the time of spooling up the barrels. Other variants included the Christmas edition and the “M134 Vulcan”. The latter variant feature eight barrels and quick bursts which only made appearance in Zombie Mode 3 and usable by the hero.
Heckler & Koch HK23E
Named simply as "HK23" in game, fed from a 100-round ammunition box. It has high flexibility and is suitable for engage the zombie bosses in Zombie Scenario Mode. It comes with a gold-plated variant and two upgraded variants. Oddly, the model always shows the weapon’s selector is set to 3 round bursts, and the extractor is at the wrong side, it shouldn’t be on the same side which the charging handle is located.
Saco Defense M60E4
The M60E4 retains its name in game. Comes with 100 round ammunition box. It is powerful, high flexibility, surprisingly accurate but low rate of fire. The weapon also comes with gold-plated and “Maverick” variants.
A variant called the Balrog VII is also based on the M60E4, it fires explosive rounds and fed with 120 rounds. The weapon is fitted with a M145 machine gun optic.
Heckler & Koch MG36
The MG36 retain its name in game, appearing as the most flexibility machine gun in the game after the “QBB95”, rate of fire is high, but the recoil is manageable. Comes with 100 round C-MAG drums and a usable optic. It has a gold-plated and a Chrismas Special variant. Interestingly, the Christmas Special variant shoot ice bullets instead of live rounds.
The PKM is fed with 150 rounds 7.62mm cartridge in a ammo box, it is powerful but inaccurate and has high recoil, could be switched between "automatic mode" or erroneously "3-round burst mode". It also comes with gold-plated and upgrade variants.
FN MK 48 Mod 0
Simply named "MK48" in game. Comes with a EO-Tech Holographic Sight, a foregrip and a 120 round ammo box, both accuracy and rate of fire are low. It has a variant called the “Thanatos-7” which can shoots a propeller-like blade via secondary firing mode. An fictional weapon called the “VULCANUS-7” is also resembles the Mk 48.
Simply named "K3" in game. Comes with a 150 round ammo box. Appears as a free-edition machine gun for players to use. It is also the spawn weapon in Zombie Scenario maps.
Appears as "M2" in game and portable. In mode A, the player will fires the gun by carrying it (fires in single only) , accuracy is extremely low and recoil is high. While in mode B, the player will installs the tripod and uses it as a mounted weapon (fires in automatic), perfectly to uses in a bunker against zombies. Unusable M2s are also seen mounted on Humvees in some maps (Reused from Counter-Strike: Condition Zero).
Grossfuss AG MG42
Named "MG42" in game, comes with a 95 round drum magazine, oddly fire 7.62 NATO rounds.
Named “M1918 BAR” in game. Classified to the rifles category and shown as a closed-bolt weapon, oddly chambered for 7.62 NATO rounds.
IWI Negev NG-7
Heckler & Koch HK121 I
Comes with a upgraded variant which has an drum-fed under-barrel grenade launcher attached below the handguard of the gun.
CIS Ultimax 100 Mk 3
Simply called the "Ultimax 100" in game, fed from a drum magazine.
The "Oz Tin Robot Machine Gun" is a heavily-modified version of the Maxim gun.
Renamed to "Schmidt Scout" in game. As in Counter-Strike, the Scout is accurate, quite and light but is weaker than the “AWP” for game balance reasons, the user will always needs to fire 2 shots to kills a enemy (except for headshots), making it a professional sniper’s choice. However the weapon is almost useless in Counter-Strike Online when other 7.62mm bolt-action sniper rifles were introduced to the game, as they are all powerful than the Scout. The model is retextured from Counter-Strike model but with a scope from Condition Zero. Comes with a red edition.
Heckler & Koch G3SG/1
Named "D3/AU-1" in game. Available for the terrorist faction. While it has a model from Counter-Strike its scope is ripped from Source. As most of the “HK slap” weapons in game, the extractor is at the wrong side, it shouldn’t be on the same side which the charging handle is located .
SIG SG550 Sniper
Named "KRIEG 550 commando" in game. Available for the counter-terrorist faction, a equivalent to the G3SG/1. It has a Counter-Strike model, with Condition Zero scope.
The VSK94 retain its name in game, comes with an integrated suppressor and exclusive to the counter-terrorist faction. Suitable to use for silent kills or uses as an SMG due to its light weight and full-auto feature. The weapon has the highest rate of fire in the sniper rifle category, but it is extremely inaccurate when firing in bursts due to high recoil and does low damage as other 9mm SMGs (using the same ammo in game). Also, the scope can be zoomed once only. Interestingly, despite that the model showing the VSK-94 has PKN-03N night vision scope attached, it still reuses the original sight reticle from Counter-Strike and the scope does not featuring any night vision functions.
Named simply "SVD" in game, as a terrorists’ equivalent to the VSK-94. The user could usually kills an enemy with a shot, although it is less accurate due to the high recoil. Comes with a variant called "SVDEX" and only available for the hero in Zombie Mode 3. It has featured a Barrett style muzzle brake, 20 round magazine, an sawn-off M203 and a unusable EOTech Holographic sight. Interestingly, despite that the model showing the Dragunov has PSO-1 scope attached, it still reuses the original sight reticle from Counter-Strike, instead of the “exclusive” sight reticle of the “M400”.
Accuracy International Arctic Warfare Super Magnum
The “AWP” is returned from Counter-Strike and named "Magnum Sniper Rifle" in game, with a few variations. Model is slightly improved of Counter-Strike and possibly Source scope. As in all of the Counter-Strike games, even the weapon is often referred to the “AWP”, it’s actually an AWSM, as the actual AWP is only chambered for 7.62 NATO rounds instead of .338 Lapua Magnum. But in reality the AWSM is only fed from a 5-round magazine. A variant called the "AWP-Z" is the zombie infected version of the “AWP”.
Named "TRG42" in game, comes with a folding stock and fed with 10 round magazine. It shares most performances as the AWP, but this rifle has different sight reticle. Comes with a variant called the "TRG42 White Gold".
Heckler & Koch SL8-1
Named simply "SL8" in game. Comes with 20 round mag and 25 round for the gold-plated version and high capacity variant. Even though this is the single stack SL8-1 variant, it erroneously uses the shorter double stack magazines of the European/Canadian variants. The high capacity variant feeds from AR-15 magazines, a possible modification for the SL8-1 done by replacing the magazine well and removing part of the receiver. The rifle is weak, but does high rate of fire and has high accuracy.
Remington M24 SWS
Called simply "M24" in the game, painted with urban camo. Erroneously comes with a 10-round detachable magazine (Its not an M24A2 as the weapon’s magazine is shorter and is almost cannot be seen. It is suggested that the weapon is just an custom Remington 700 rifle) . The user could usually kills an enemy with one shot in middle ranges.
Cheytac M-100 Intervention
Appears as the "M400" in game. These screenshots showing the weapon is chambered for .338 Lapua instead of .408 CheyTac , and the model doesn’t features a carrying handle and a handguard, implying that the weapon is NOT an Cheytac M200 Intervention. It is an Cheytac M100, a simply rechamber version of the Windrunner M96, although the ingame weapon is not .408 caliber and fed from a 10 round magazine. In game, this rifle has its exclusive sight reticle.
Walther WA 2000
The WA2000 retains its name in game and erroneously feed with 12 rounds. It is powerful and accurate. The rifle also comes with a gold-plated variation which fed with 15 rounds.
The M95 retains its long name in game as "Barrett M95". Suitable to use for long range sniping and cleaning up hostiles behind walls and obstacles. In Human Scenario Mode, it is also used against enemy helicopters and bosses due to its high damage ammunition. However, like most of the high caliber bolt-action sniper rifles in game, the M95 is not easy to control due to its heavy weight. The weapon also comes with a Christmas special edition variant.
Remington XM2010 Enhanced Sniper Rifle
The Remington XM2010 Enhanced Sniper Rifle is named the "XM2010", appears as the one of the most powerful sniper rifle in the game and fed with 5 rounds. It does higher damage then the M24 but has lower capacity, the rifle also share the same reticles as the M24 and the Parker-Hale.
Accuracy International AS50
The AS-50 is an anti-material sniper rifle which fires in semi-automatic and fed with 5 round magazine. Like the M95, the rifle is suitable to use for long range sniping and cleaning up hostiles behind walls and obstacles. In Human Scenario Mode, it is also used against enemy helicopters and bosses due to its high damage ammunition. It's also effect against zombies. As most of the high-caliber sniper rifles in the game, the user could usually kills an human target with a shot at any distances without any problems. The weapon also comes with two upgrade variants, a pink gold edition, and a “Vandita” variant. Interestingly, the weapon has a very similar reloading animation as the AS50 appears in Call of Duty: Modern Warfare 3.
The Parker-Hale 1200 is an British-made bolt-action sniper rifle which shares similar performance to the M24, appears as the “M82” in game (Although its not actually an Parker-Hale M82, note the details of the buttstock). It erroneously has a 10 round (or even higher in upgraded variants) detachable box magazine plus its ZF-69 scope can be zoomed once only. Moreover, the rifle shares the same sight reticle as the M24 and the ESR.
Blaser R93 LRS2
Named simply as "R93" in game. It has lighter weight than the AWP and has higher rate of fire, comes with a 5 round mag.
Accuracy International AW50F
Named "AW50" in game. Comes with a 5 round mag.
Heckler & Koch PSG1A1
Named "PSG1A1" in game. Comes with a 5 round magazine.
An Hungarian M/52 rifle is named "Mosin-Nagant" in game (distinguishable by the "02" and "B" markings engraved on the buttstock), fed with 5 rounds and uses old scope reticle from Counter-Strike, oddly chambered for 7.62 NATO rounds.
PGM Hecate II
Called the “Hecate II” in game, possibly influenced by Sword Art Online II.
M67 Hand Grenade
Named "Fragmentation grenade" in game and unlimitedly supply to the players in the "Frag War" mode, it also has a incendiary grenade variant which available in the zombie modes.
Model 24 Stielhandgranate
Named simply as "M24 Grenade" in game.
M79 Grenade Launcher (Sawn-Off)
Named "M79 Saw-Off" in game. It's frequently used by players in earlier Zombie Scenario Mode gameplays due to the weapon could kill at least a dozen of zombies. It comes with a gold-plated variant and a variant called the "Shooting Star". The “Janus-1” is the heavily-modified version of the M79, it features a fake holographic sight instead of the original rear sight.
Milkor Mark 14
Appear as the "M32 MGL".
Heckler & Koch XM25 CDTE
An fictional weapon called the “VULCANUS-5” resembles the XM25, however it is an asaault rifle which fires smart bullets instead of 25mm grenades and is fed from a 40-round high capacity box magazine.
M203 Grenade Launcher (Sawn-Off)
Appear as a part of the "SVDEX". The user could blow off enemies with it. Some game posters have also shown a special forces operative of unknown nationality wielding an Aimpoint Comp, flashlight plus M203 attached M4A1.
Mk 19 Grenade Launcher
The mounted machine gun in Zombie Scenario Mode is seems to be based on the Mk 19. However it doesn't fire explosive rounds and the hud icon showing the weapon is chambered for .50 BMG instead of 40x53mm grenade.
Bofors M136 AT4
Named "AT Lance" in game. Available only in the "Human Scenario" and "Metal Arena" modes. It's usually used by players in Human Scenario Mode to engage enemy helicopters and bosses. Comes with an AT4-CS variant which is available in all game modes. Interestingly, these launchers are reloadable in game.
The RPG-7 is comes with 5 spare rockets in game. It appears to be the only existing weapon in CSO featuring usable iron sights.
A heavily modified version of the Bazooka is the primary weapon for the players in "Bazooka mode". It comes with a 20 round ammo box and a usable scope.
The M14 landmine appears in the zombie union mode.
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