Grand Theft Auto V
Nice, but where's the trigger?
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Grand Theft Auto V (also known as GTA5 or GTAV) is the fifth installment of the Grand Theft Auto series being developed by Rockstar North, and published by Rockstar Games. The game was announced October 25, 2011 with its trailer debuting on November 2. The game was released for XBox 360 and PS3 on September 17th, 2013. It was re-released in enhanced form for the PlayStation 4 and Xbox One on November 18th, 2014, with a Windows PC version released, after numerous delays, on April 18th 2015.
The game is set in an expanded version of GTA: San Andreas' starting city of Los Santos, a fictionalised version of Los Angeles, and the surrounding countryside. The plot follows a trio of characters, who the player can select between; an ambitious young gang member named Franklin who falls in with retired bankrobber Michael, who is part of a government witness protection program following his last big job. When Michael returns to a life of crime, it attracts the attention of one of his former associates, a lunatic meth dealer named Trevor, and the secrets of Michael's last job threaten to cost him everything he has.
The game is also packaged with an online multiplayer component labelled Grand Theft Auto Online, which is treated as a separate title by Rockstar but is in effect largely based on the main game and is not available for purchase separately. However, there are some differences between the two titles, and some weapons are available only in multiplayer, and vice versa.
The following weapons can be seen in the video game Grand Theft Auto V and are available in both 7th and 8th generation versions unless otherwise noted:
Grand Theft Auto V features a wheel-based inventory system where the player characters can carry every weapon in the game at the same time, with weapons subdivided into a series of slots: pistols, SMGs and machine guns, assault rifles, sniper rifles, melee weapons, shotguns, heavy weapons and throwing weapons. Each of the three playable characters in singleplayer has their own inventory.
Weapons can either be found in the game world, acquired during missions or purchased from the Ammu-Nation gun stores found throughout Los Santos. A purchased gun is unlocked permanently and in most cases can then be upgraded with custom parts which improve its handling or increase its capacity; suppressors can also be added to some weapons. Each weapon must have mods bought for it individually, they cannot be swapped between weapons.
In the original releases a series of DLC weapons were added in free updates following the game's release, eventually filling up an entire additional wall in Ammu-Nation. In the next-gen re-release and PC version, these weapons are instead staggered unlocks that are given out as the story progresses. DLC weapons tend to be ridiculous money sinks with incredibly expensive upgrades.
The next-gen re-release also adds the ability to switch to first-person mode for shooting, with new high-detail gun models and animations. In this mode, using the zoom function (R3 / press RS / mousewheel up) while aiming a weapon will use the weapon's iron sights, or the scope if a weapon has one. Sniper rifles, as usual for the series, always use their scope when aiming.
The "AP Pistol", though probably supposed to be some kind of TDI Kard knockoff, bears most resemblance to the Colt SCAMP, an obscure prototype burst-fire pistol, though it is depicted with a traditional pistol slide. It holds 18 rounds in its magazine (36 with the "Extended Clip" attachment). Assuming it is actually supposed to be a SCAMP, the weapon is normally incorrectly shown as fully automatic, but during the rappelling part in "Three's Company", it is for some reason shown in the correct 3-round burst mode. The lettering on the slide states it is chambered in 9x18mm.
What appears to be a combination of the Heckler & Koch P2000 and the Beretta Px4 Storm is available as the "Combat Pistol". It holds 12 rounds in its magazine (16 with the "Extended Clip" attachment). It is chambered in 9mm "ACB." It is used by Agency spooks first seen in Michael's mission "Dead Man Walking", and can be purchased for other characters afterwards at Ammu-Nation.
A poorly-modelled Desert Eagle is available as the "Pistol .50" as a special edition bonus weapon. It holds 9 bullets in the magazine, which should make it a .357 Magnum (.50AE Desert Eagles hold 7 rounds) but the next-gen model has a clear ".50AE" marking on the barrel. It incorrectly has an optional extended magazine of 12 rounds and is double action only.
The weapon model lacks the long beavertail of an actual Desert Eagle and has a trigger guard that bears more resemblance to the PT92, has oversized cocking serrations and a much too curved top to the rear section of the slide, chunky rear sights with a tiny front sight pin, and incorrectly has an underbarrel accessory rail. It also has no scope rail mounts, no barrel lock, no magazine release, and lacks the Desert Eagle's safety switch; the developers appear to have confused the slide release for the safety, and so the pin for the slide release is attached to nothing and the projecting part has been turned into a sliding selector, the mechanics of which are best not considered.
Entreprise Arms Wide Body 1911
A 1911 handgun styled after the Entreprise Arms Wide Body 1911 appears as the "Heavy Pistol." It was released for last-gen consoles with the "Business Update" DLC, while in the next-gen versions it is unlocked along with the "Combat Pistol" following the mission "Dead Man Walking." It has a miniature red dot sight modelled on the slide, which is purely cosmetic in the original third-person view, but is a fully functional sight in first-person mode in the next-gen versions. The weapon comes with an incorrect 18 round magazine and can be upgraded with a ridiculous 36 round extended magazine, as well as the usual pistol mods (suppressor and weapon light).
FN Model 1922
What appears to be a FN Model 1922 is available as the "Vintage Pistol" with the "I'm Not a Hipster" DLC. It holds 7 rounds (14 with the "Extended Clip" attachment), whereas the real Model 1922 holds 8 or 9 rounds (though the 7-round capacity would be correct on the Model 1910 variant). The weapon can also be fitted with a suppressor.
A Glock 23 compact pistol is seen in the holster of the armoured truck guards, motorcycle cops, Los Santos Police Officers, IAA Agents, FIB Agents and Merriweather PMC troops, however they cannot be used and the guards will still attack the player using a Taurus if they draw a pistol. It is assumed this is a Glock 23 because of the .40SW ammunition, which is used in the United States by almost all security services and because of the large rear sights.
The Patriot Beer logo, found on various products throughout the city, features a pair of old percussion LeMat 1861 revolvers.
Orion Flare Gun
The Orion Flare Gun was included in "The Heists Update", although it was originally intended as part of "The San Andreas Flight School Update". Although it has the paint job of the 12 gauge variant, the weapon model matches more that of the 25mm version.
The "SNS Pistol" is available with the "Beach Bum Pack DLC" and seems to be a Colt Junior with some design elements also similar to the Heckler & Koch P7. It holds 6 rounds in its magazine (12 with the "Extended Clip" attachment), but has no other accessories, rendering it rather a pointless weapon.
The "Pistol" is a Taurus PT92AF. It is the first pistol the player characters can get, and Michael and Trevor both have one in their starting inventory. It holds 12 rounds in its magazine (16 with the "Extended Clip" attachment), while its real counterpart holds 10, 15 or 17 (though the 12-round magazine would be correct for the compact variant, the PT92C). In-game it is incorrectly referred to as being .45 caliber instead of 9x19mm. However, in the mission "Complications", Michael correctly refers it to a 9mm. In Grand Theft Auto Online, players are automatically given one of these pistols at the start of every session.
Taurus Raging Bull
The "Executives and other Criminals" update for GTA Online finally brings a revolver to the game's arsenal of sidearms. It appears to be another frankengun, based on the Taurus Raging Bull's barrel mated to the frame of an ASG Dan Wesson CO2 revolver as evident by the straighter grip which also lacks the distinctive red Raging Bull backstrap, and is referred to as "Heavy Revolver". For whatever reason, the weapon is treated as a single action and is always cocked after each shot, in an arduously slow process. Given its six shot capacity, it is likely chambered in .44 Magnum.
Thompson Center Arms Contender
The Thompson Center Arms Contender appears in the game as the "Marksman Pistol", and is added with the "Ill-Gotten Gains Part 2" DLC. It is a single shot pistol and has no other accessories. It also deals the highest damage of all the other weapons, including the "Heavy Sniper Rifle".
While playing Righteous Slaughter 7, an in-game FPS video game, in his bedroom, Jimmy's game character can be seen using a stainless steel Walther PPK in tandem with a syringe similar to the USP45/tactical knife combo in Call of Duty: Modern Warfare 2.
A SIG-Sauer P226 is shown in the in-game TV show Underbelly of Paradise as a part of illegal weapon trafficking. It can be identified as such by the double stack bulge on the frame. It also appears to have been rendered without a hammer.
Unknown Glock Variant
A Glock pistol of unknown model is shown beside the P226 on the in-game TV show Underbelly of Paradise as a part of illegal weapon trafficking.
The "Assault Shotgun" is largely based on the UTAS UTS-15 with the addition of a box magazine and some other modifications such as a longer stock and relocating the barrel to the position the magazine tubes normally occupy. The original UTS-15 has a manual pump-action; however the "Assault Shotgun" seems to think it is an AA-12 and is fully automatic, with 8 and 32-round capacities like the latter shotgun as well.
The Kel-Tec KSG, called the "Bullpup Shotgun", was a bonus weapon available in the Special Edition of the original release; it is included with every copy of the next-gen versions. It comes with a 14-shell capacity, and like all games that feature the KSG, its 2 magazine tubes are depicted, mechanically, as a single long tube. Like the other pump-action shotguns, it is reloaded with just one shell.
The "Sawed-Off Shotgun" in the game is a truncated Compact Cruiser-style Mossberg 500. It comes with an 8-shell capacity (while a shotgun this size would only be able to hold somewhere between 2 and 4), and like with the larger Mossberg the reloading animation shows only one shell being inserted. It is uniquely capable of being used on motorcycles, buses and boats as a driveby weapon. In GTA Online component, this weapon replaces the "Assault SMG" as the free weapon for Rockstar Social Club members, with the Assault SMG being a rank-based unlockable for all players.
The "Pump Shotgun" in the game resembles a slightly shortened Mossberg 590 (somewhere between standard and Cruiser length) with an oversized forend, a heat shield and a Magpul CTR stock; it comes with an 8-shell magazine capacity. The reloading animation depicts only one shell being inserted, regardless the number of shells needed. It is the standard shotgun of the LSPD and the LS County Sheriff's Department.
The Saiga 12K appears with an ACE folding stock and a rail (which has some similarity with Chaos quad rails) as the "Heavy Shotgun", added with the "Last Team Standing Update" DLC. It holds 6 slug shells in its magazine (12 with the "Extended Clip" attachment) and can also be fitted with a flashlight, a suppressor and an angled Magpul AFG2 foregrip.
The GTA Online: Further Adventures in Finance and Felony update added a drum magazine attachment to some weapons, including the Saiga 12K, which gains a capacity of 30 shells with it.
Sawed-Off Double Barrel Shotgun
A Sawed-Off Double Barrel Shotgun appears in the "Lowriders: Custom Classics" DLC.
Heckler & Koch MP5A3
A Heckler & Koch MP5A3 with an odd angular receiver seemingly based on the Taurus MT-40 from Max Payne 3 appears as the "SMG". It holds 30 rounds in a 15-round magazine, and 60 in the 30-rounder. While it is probably supposed to use an HK slap-style reload, in the next-gen first-person view the player character is actually shown slamming the side of their fist against the charging handle, which would be unlikely to do much other than break the gun and hurt their fist as it slams against the handle.
The MP5A3 can be equipped with a 100-round drum magazine after the GTA Online: Further Adventures in Finance and Felony update. However, it has the appearance of a single drum; a dual drum Beta C-Mag would be more appropriate.
The Intratec TEC-9 appears as the "Machine Pistol" and is added with the "GTA Online: Lowriders" DLC. It holds 12 rounds in its magazine (20 with the "Extended Clip" attachment.)
It can be equipped with a drum magazine after the GTA Online: Further Adventures in Finance and Felony update. However, this one has a capacity of merely 30 rounds, which in reality could simply be achievable with a 32-round standard box magazine; real drum magazines for the TEC-9 have a capacity of 72 rounds.
A .45 ACP Mini Uzi is available as the "Micro SMG", and is one of the non-pistol firearms that can be used while driving. It defaults to a 16 round magazine more normally used on the full-sized Uzi (the Mini Uzi usually being sold with a 12-rounder) and can be upgraded to incorrectly use a 30-round 9mm magazine (the .45 ACP magazine of that size only has a capacity of 22 rounds). The beta version had an incorrectly slanted magazine, but this has been corrected in the final game. When the Scope attachment is added, the character unfolds the stock and properly shoulders the weapon, otherwise, the stock is folded and the weapon is fired from the hip. It is chambered in the oddly named ".45 ACB" and its charging handle is erroneously displayed as being reciprocant instead of fixed while the gun is discharged.
In the cartoon Gordon Moorehead Rides Again, the titular detective encounters an inexplicable Nazi security guard outside Vinewood Studios, brandishing an MP40.
The SIG-Sauer MPX is available with the "Ill-Gotten Gains Part 1" DLC update as the "Combat PDW". Its length matches more the MPX-SD variant, and the weapon is actually integrally suppressed in-game, but the model lacks a suppressor.
It can be equipped with a 100-round drum magazine after the GTA Online: Further Adventures in Finance and Felony update, despite the appearance showing a size similar to that of the X Products 50-round drum magazine. The real MPX cannot have a capacity of more than 50 rounds either way.
This gun is available with the Valentine's Day Massacre Special DLC as the "Gusenberg Sweeper". It seems to be a Thompson M1928A1 with a drum magazine that incorrectly holds 30 rounds. The extended clip attachment ups the ammo count to the correct 50 rounds. It shares an ammo pool with the belt-fed machine guns instead of the sub-machine guns.
The game incorrectly displays the gun action as being closed bolt instead of an open bolt action.
Assault Rifles & Carbines
The AKMSU appears as the "Compact Rifle" in the "Lowriders: Custom Classics" DLC.
It can be equipped with a 100-round drum magazine after the GTA Online: Further Adventures in Finance and Felony update. However, it has the appearance of a 75-round drum magazine; the 100-round U-shaped large magazine used for 7.62x39mm AKs would be more appropriate in order to mach the in-game capacity.
This fictional assault rifle (classified in-game as an SMG) described as firing 6x30mm cartridge is a bonus unlock for players who join the Rockstar Social Club; it bears a resemblance to several real guns, particularly the Magpul PDR-C and FN P90 TR. It can be fitted with a 30 or 60 round magazine. In GTA Online, this weapon is a rank-based unlock for all players, with the Sawed-Off Shotgun replacing it as the free weapon for Social Club members.
The "Bullpup Rifle" is a fictional carbine consisting of the rear of a Norinco Type 86S, QBZ-95-1 midsection and lower handguard, Norinco QBZ-95 selector switch and LAPA FA03 for the front part and cooling vents. It is added with the "High Life Update" as a part of the GTA Online "Spring Update". In-game it is said to be a Chinese import. Its front sight is recycled from the GTA IV Carbine Rifle, and the weapon uses the same magazine models from the Type 56, as does the real world Type 86S.
Custom AR-15 Carbine
The "Carbine Rifle" is a custom AR-15 carbine consisting of an ACE skeleton stock incorrectly portrayed as collapsible, Northtech Billet lower receiver with an ergonomic pistol grip, VLTOR upper receiver, a handguard resembling the Daniel Defense MFR 9.0, and a 10.5" barrel with an AAC Blackout flash hider. Its sights are a rear folding backup sight probably based on the MBUS and a Troy folding front battle sight. It can be fitted with an ELCAN SpecterDR scope, which is incorrectly depicted as a simple red dot sight, flashlight, 30 or 60 round magazine, a Magpul AFG2 foregrip, and a sound suppressor. Due to the silver color of the bolt carrier group and the very flat shape, it is probably rendered with an airsoft gun rather than a real AR-15.
The extended magazine seems to be based on a 40 round one; it is only slightly longer than a 30-rounder, and is still a double-stack configuration. For a magazine of the length shown to hold sixty rounds, it would have to be a much thicker quad stack casket-type magazine.
The GTA Online: Further Adventures in Finance and Felony update gives it the ability to equip a box of 100 rounds, oddly having the appearance of an LMG-style belt box, whereas a 100-round Beta C-Mag would have been much more appropriate.
Heckler & Koch G36C
The Heckler & Koch G36C, called the "Special Carbine" in-game, is part of the Business Update DLC. It incorrectly has a 6 vent-holes on the short C handguard, and utilizes straight metal magazines similar to the Galil 7.62 ARM. It also has a custom charging handle that juts out on both sides of the weapon, rather than a flush charging handle. The next-gen version is also shown with ejection ports on both sides of the weapon.
The G36C can be equipped with a 100-round Beta C-Mag after the GTA Online: Further Adventures in Finance and Felony update.
IMI Compact Tavor CTAR-21
The "Advanced Rifle" appears to be a IMI Compact Tavor CTAR-21 with a raised scope mount. It has an open pistol grip with a traditional trigger guard (similarly to the MTAR-21) instead of the real CTAR-21's closed handguard. A screenshot previously released by Game Informer showed a more correctly modeled CTAR-21 with a green finish. It can be fitted with a red dot sight based on an Aimpoint M2 with the M4S battery storage location, flashlight, suppressor, and a 30 or 60 round (based on a 40 round) magazine.
Norinco Type 56
Boxes of 7.62mm ammunition inside Ammu-Nation stores show an import Norinco Type 56 with a fixed stock.
Norinco Type 56-2
The "Assault Rifle" is a Norinco Type 56-2 with an aftermarket TAPCO Intrafuse handguard and ergonomic pistol grip. It can be fitted with a red dot sight (which resembles an Aimpoint Micro T1), Magpul AFG2, flashlight, suppressor (based on the PBS-1 suppressor of the AKS-74U), and a 30 or 60 round magazine (the latter being modeled after a 40-round mag).
It is the standard low-rank assault rifle and is frequently seen in the hands of gang members in later missions; more oddly, it is also seen in the hands of Merriweather PMC operators and US Army and Marine Corps troops at Fort Zancudo, though in the latter case the gate guards at least use the fictional AR-15 carbine rifle.
The Type 56-2 can be equipped with a 100-round drum magazine after the GTA Online: Further Adventures in Finance and Felony update. Like with the AKMSU, it has the appearance of a 75-round drum magazine, whereas the 100-round U-shaped large magazine would be more appropriate.
Robinson Armament XCR
When playing Righteous Slaughter 7 in his bedroom, Jimmy's game character can be seen using a Robinson Armament XCR in the CQB configuration. This weapon is not available in the game for player use.
Accuracy International AW-F
An Accuracy International AW-F is the standard sniper rifle in the game, with a 10-round magazine, though the ingame magazine juts out further from the weapon, and should logically hold closer to 20 rounds due to its size. At the start of the mission "Nervous Ron", Trevor intimidates the clerk at his local AmmuNation into giving him this rifle as well as a high-powered scope and suppressor for free. Oddly, when doing missions for Cleetus the weapon is automatically reverted to the standard scope and paint scheme.
A Barrett M107 incorrectly shown with a raised full length scope rail like an M82A3 (but styled after the short raised rail of the A1) is available as the "Heavy Sniper." It incorrectly holds 6 rounds per magazine instead of 10, and the magazine itself is wrongly shown being inserted straight rather than rocked into the magazine well. When aiming down the scope, probably due to an oversight, the sound of a bolt operation can be heard after each shot, despite the weapon being semi-automatic; however, it isn't heard when firing without aiming. The M107 is also used on an electronic rig in the back of a van to shoot down Javier Madrazo's commercial jet in the mission Caida Libre.
The Ruger Mini-30 appears as the "Marksman Rifle", added with the "Last Team Standing Update" DLC. It has an ACE Skeleton stock (incorrectly shown as collapsible, as on the Carbine Rifle), and feeds from curved box magazines similar to those used by various rifles chambered in Soviet 7.62x54mmR or 7.62x39mm. It comes equipped with a scope and 8-round mags (16 with the "Extended Clip" attachment) and can also be fitted with a flashlight, a suppressor, and an angled Magpul AFG2 foregrip. Oddly, it ejects larger cartridges than the .50 BMG Heavy Sniper, when it should eject a much smaller casing. A major advantage this rifle had over the other two sniper rifles in the last-gen versions was that the player character could move while aiming through the scope. This, however, came at a cost of a relatively low-power scope with fixed magnification. The next-gen versions default to allowing characters to move while aiming sniper rifles (this was made an option on the previous generation version), meaning the Mini-30's advantages are limited to higher capacity and rapid fire. The rifle also features the same gas system as an M14, giving it some resemblance to a rifle of the EBR family.
GE M134 Minigun
A handheld GE M134 Minigun is available for the heavy weapon slot; the weapon is shown with no power supply or ammo feed, and loads every round the player has at once (a maximum capacity of 9999 rounds). The M134 is also seen in the non-playable FPS Righteous Slaughter 7.
Mk48 Machine Gun
The "Combat MG" featured in the game is a Mk 48 Mod 0 with the the sloped heat shield front of a Mod 1 and the buttstock of an M60. The handguard is visually halfway between the Mk 48 and M60 and the heat shield is low-profile like a Mk 48 Mod 1 but has a top rail like a Mod 0. It can accept all attachments except the flashlight and suppressor, and can be fitted with a 100 or 200 round belt. By default the weapon is fired from the hip, but when the Scope attachment is added the character will actually shoulder the weapon and fire it like an assault rifle. Michael is given one for free during the mission "Blitz Play" equipped with a scope and grip, and the weapon become available at Ammu-Nation afterwards. For some reason, the mission "Monkey Business" seems to steal Michael's Mk 48, meaning he will have to purchase it again afterwards.
A PKM with synthetic furniture, a significantly shorter gas tube and an RIS handguard similar to that of the DSA RPD appears as the "MG". It has an RPD circular drum, which could not attach to the socket under the PKM, and with a strange capacity of 54 rounds by default, but the "Extended Clip" attachment gives it a standard PKM belt box with the correct capacity of 100 rounds. Oddly, it is unlocked at Ammu-Nation after the Mk 48, despite being an inferior weapon with fewer upgrade options, though it can be found hidden in the game world prior to this.
What appears to be a FIM-92A Stinger (though the launch tube seems to have a slimmer profile, closer to an SA-7 Grail) is added as the "Homing Launcher" with the "Festive Surprise" DLC. It is incorrectly shown as reloadable with a muzzle-loaded round, most likely so the reloading animation for the RPG-7 could be re-used for it.
What appears to be a homemade Panzerschreck was added as the "Fireworks Launcher" with the "Independence Day" DLC released in July 2014. It is fitted with a muzzle-loaded firework rocket instead of the normal rear-loaded hollow charge, and is also painted with the American flag. It was a limited time only item in GTA Online and is also the only DLC weapon to be removed from GTA V's story mode; after it was removed it was no longer available in Ammu-Nation, though the Fireworks Launcher would remain in the inventory of any player character who still had ammunition for it in singleplayer. It has so far been available twice in the Xbox One and PS4 versions; it was available on December 25th 2014 and again on January 1st 2015. So far, there is no way to acquire it during gameplay in the PC version.
The Firework Launcher is essentially a toy rather than an effective weapon; even firing it at the player character's own feet will only cost about half their health, and rockets are more expensive than rounds for the RPG-7.
Milkor Mark 14 MGL
A Milkor Mark 14 MGL appears in the game with a Magpul CTR stock. It has an unrealistic capacity of 10 grenades instead of 6, and is reloaded by inserting just one round into the cylinder. As is common in videogames, it fires unrealistic "smart" grenades which detonate on impact with humans, animals or vehicles, otherwise exploding on a timer. It is the first launcher to be unlocked, and is given to Trevor for free by his "cook", Chef, when the two have to defend Trevor's meth lab after he angers a local gang.
The RPG-7 with PG-7V (ПГ-7В) and custom polygonal breech is the only rocket launcher available without DLC in the original release. The next-gen version oddly has the front sight of an M136 AT4, as well as a series of rather silly warnings on the launcher including "point toward enemy" and a painted reminder to not aim the RPG-7 at pets or feet.
M112 C4 Demolition Pack
"Sticky bombs" made from a pair of mysteriously self-adhesive M112 C4 demolition packs rigged to a remote detonator are available as a thrown weapon, first available in Trevor's mission "Friends Reunited" when he is given twenty of them for free to blow up a trailer park used by The Lost MC biker gang. After this, all characters can buy them from Ammu-Nation. The charges are thrown like grenades and stick to surfaces, or can be placed if the player character is close to a wall. Every charge currently placed is detonated at the same time if they are set off using the detonate command, or they can be individually triggered with gunfire. The latter is unrealistic unless the gunfire somehow damages the detonator in a way that makes it operate, since C4 is an insensitive explosive.
M18 Smoke Grenade
The M18 smoke grenade appears as the "Tear Gas" grenade. The same model is also used for the pesticide grenades used in one approach to the jewellery store heist in singleplayer.
M61 Hand Grenade
The M61 hand grenade appears as the "Grenade".
Mk 2 Hand Grenade
The "GTA Online Lowriders" update includes allows certain cars to have custom gear shift levers, one of which resembles the Mk 2 hand grenade.
The "Rhino", a fictional tank closely based on the German Leopard 2A4, mounts an unusable Browning M2 on the commander's hatch. "The Heists Update" for GTA Online later added a vehicle to multiplayer called the "Insurgent", the pickup variant of which features a usable roof-mounted M2HB, although it is unobtainable in singleplayer.
For no obvious reason, a Soviet T-34-85 can be found in a junkyard in Los Santos. Even more curiously, it retains its hull-mounted Degtyaryov DT machine gun; these are usually not shown even on tanks that are supposed to be real, since videogame tanks are often based on museum pieces with empty hull gun mounts.
The Heists Update added the "Technical" vehicle to GTA Online, which is a Karin Rebel (Toyota Hilux parody) flatbed truck with a DShK heavy machine gun mounted on the back, equipped with an anti-aircraft sight.
General Dynamics GAU-17/A
The Valkyrie helicopter, added to GTA Online in the Heists Update, has two door-mounted GAU-17/A miniguns.
Mounted M134 Miniguns appear in wing mounts on the Buzzard and Annihilator helicopters. The "Savage" gunship, which is a Hind-D, should probably have a Yakushev-Borzov Yak-B gatling gun, but instead has a six-barrel rotary chin gun which appears to be a stretched-out M134.
M230 Chain Gun
Hunter attack helicopters (based on the AH-64 Apache) equipped with the M230 Chain Gun can be seen in the trailer for the in-game movie The Simian, which can be seen when going to a movie theater while hanging out with a friend. The Hunter does not yet appear in the game proper.
The "P-996 Lazer" fighter jet, a cross between the F-35, F/A-18 and F-16, is equipped with a pair of M61 Vulcan cannons, with the one installation an F-16 should have mirrored on both sides of the fuselage.
The Heists Update also added a mission set on an aircraft carrier, equipped with M61 Vulcan cannons in Phalanx CIWS installations.
Conversely, the aptly named "Valkyrie" (UH-1Y Venom with the tail similar to that of a Eurocopter Dauphin) gunship sports the Yakushev-Borzov Yak-B 12.7mm Gatling gun in a nose turret. It is remotely controlled by players sitting in the copilot's seat, and is treated more like a slow firing autocannon with high-explosive rounds.
A musket is added with the "Independence Day" DLC. This Musket barely resembles a Land Pattern Musket and it has a Jezail-like semi-pistol grip instead of a straight grip, most likely so it can use the same hand positions as the sniper rifles. The weapon seems to be based on the M107 in terms of gameplay mechanics; it is extremely accurate, hugely powerful, and can penetrate multiple enemies if they are lined up; none of these are traits traditionally associated with a smoothbore musket firing lead balls. As can be expected for a muzzle-loading weapon, it has a very low rate of fire, taking several seconds to prepare a new round for firing. The animation is actually unrealistically short, however, showing player characters simply adding powder and a ball without using a ramrod, which would not allow either to be properly seated at the breech of the weapon. They also do not refill the flash pan, meaning the weapon would not actually fire, and the serpentine resets itself immediately after falling. For reasons which are not entirely clear, it counts as a shotgun. Though many smoothbore muskets can and have historically loaded buckshot for certain applications, they are not generally classified as shotguns.
A Taser-like device is available as the "Stun Gun", first unlocked by doing Trevor's "Border Patrol" missions. While it fires out wires to deliver a shock, it is functionally rather like the Stun Knife in Metal Gear Solid 4: it can fire a shot every 3 seconds, which is the time it takes for the power meter to be recharged from 0 to 100. The weapon's model most closely resembles the Stinger S-200 from the defunct Stinger Systems. The rear of the weapon however bears a striking resemblance to a Glock pistol.
Unlike real-life Taser-type weapons, the "Stun Gun" does not need to replace cartridges or wires, nor does it have limited battery power. It is also worth noting that the term "Stun Gun" normally refers to contact electroshock devices rather than ones that can engage a target at range. The proper term would be a Conducted Energy Weapon.
A rail gun appears in the high-def versions as a bonus for players who have already played the previous console version of GTA V: it is a rather odd "bonus", considering it still costs a quarter of a million dollars at Ammu-Nation. It is in the heavy weapon slot and despite having a detachable magazine has only a single-shot capability, with a maximum ammunition limit of 20 rounds (including the one loaded). It does not feature in GTA Online. True to its nature, it hits targets almost instantly. The weapon is an obvious work of fantasy; as yet it is not possible to build a smallarm-scale magnetic accelerator which is capable of any level of power that would make it useful as a weapon.
These weapons are generally images which can be found in the game files: no associated models appear to exist for them.
In beta versions of the game the "Assault SMG" was more closely modelled on the FN P90.
The FN SCAR-H was going to appear as the "Heavy Rifle", with a different buttstock.
Heckler & Koch HK21
Heckler & Koch XM25
The Heckler & Koch XM25 was going to appear as the "Programmable AR", presumably standing for "Airburst Round." Tutorial messages left in the game files show it was intended to include airburst functionality; when aiming, the first press of the trigger would have set the detonation distance, with subsequent presses firing grenades. Presumably, the player would have to stop aiming the weapon to set a new detonation range.
Knight's Armament Company M110A1 SASS
The M110A1 SASS was going to appear as the "Assault Sniper".
The beta "Combat MG" was an M249-E2 SAW with a para-length barrel, RIS receiver cover and an incorrect rail on top of the heat shield.
Mk. 18 Mod 0
Several promotional images, some of which are used as loading screens in the final game, imply the fictional custom AR-15 was originally going to be a Mk. 18 Mod 0.