Promotional image:The P30 is visible in Hawkeye's holster.
Agent Barton/Hawkeye (Jeremy Renner) fires his P30 at Agent Hill.
A possessed Hawkeye fires his H&K P30.
M1911A1
In one of Captain America's (Chris Evans) flashbacks of his adventures during World War II, Captain America is seen wielding an M1911A1 along with his shield in what is apparently footage from Captain America: The First Avenger.
One of Loki's mercenaries uses a Saiga 12K during the Helicarrier assault.
Saiga-12K - 12 Gauge
The man directly behind Hawkeye has a Saiga 12K. The barrel appears to have been cut down.
A mercenary in Loki's hideout with his Saiga 12K slung.
Submachine Guns
KRISS Vector
The KRISS Vector is seen being used by one of the mercenaries accompanying Hawkeye as they board the ship. It is seen again later as the mercenary shoots at Captain America.
Kriss Vector with TDI vertical foregrip and EOTech XPS2-0
Promotional image, the soldier on the right has a Vector.
The mercenary to left carries a KRISS Vector fitted with an EOTech sight and what appears to be a tactical flashlight.
On the far left, the operative carries a KRISS Vector.
The operative uses the KRISS Vector to engage Captain America.
Heckler & Koch UMP
One of the mercenaries accompanying Hawkeye carries a Heckler & Koch UMP.
Heckler & Koch UMP45 - .45 ACP
The mercenary in the center has a UMP. Only the stock is visible.
Rifles
M4A1 Carbine
Members of the New York National Guard are seen with M4A1 Carbines during the battle on the streets of Manhattan. SHIELD agents carry M4A1 equipped with EOtech MPO holosights while escorting a restrained Loki.
Colt M4A1 Carbine with M68 Aimpoint reflex optic and Knight's Armament RAS railed handguard and vertical forward grip - 5.56x45mm
A production image of M4A1-equipped SHIELD agents escort Loki (Tom Hiddleston).
Another shot of the SHIELD agents with Loki.
Several SHIELD agents open fire on Loki moments before Loki kills them with several throwing knives.
A close up of the same shot, showing the M4A1's accessories and receiver.
A rack of M4A1 Carbines fitted with EOtech MPO holosights, Surefire M82 tactical rails, and OTAL laser sights in the SHIELD helicarrier.
National Guard soldiers aim their M4A1s while a few of them cover fleeing civilians.
A soldier opens fire with his M4A1.
Noveske Rifleworks Diplomat
Steve Rogers/Captain America (Chris Evans) is briefly seen firing a Noveske Rifleworks Diplomat taken from a mercenary disguised as a SHIELD agent. The rifle appears to fitted with a Vltor VIS upper.
Noveske Rifleworks Diplomat with M68 Aimpoint red dot scope and Surefire M900 weapon-light fore-grip - 5.56x45mm
A mercenary with his Noveske Rifleworks Diplomat fitted with a Vltor VIS upper before engaging Captain America.
Mercenaries disguised as SHIELD agents can be seen carrying accessorized AKM rifles.
AKM - 7.62x39mm
Promotional image: the mercenary on the left is carrying an AKM.
The operative on the right carries the AKM.
AK-47
During the interrogation of Black Widow, seen are crates full of AK rifles (most likely replicas) at the beginning of the movie.
Poly Technologies AK-47 - 7.62x39mm. This is the commercial clone of the original Type III AK-47 and is the most used in American films and shows when showing the milled receiver AK-47
Crates of AK's are stacked behind where Agent Romanov/Black Widow is interrogated.
General Dynamics GAU-17/A, US Air Force version of the M134 Minigun - 7.62x51mm NATO
A SHIELD Quinjet flown by Black Widow in Stuttgart aiming a GAU-17 at Loki's position.
The GAU-17 is seen being deployed from Black Widow's Quinjet.
M249 SAW Para
One of Loki's mercenaries can be briefly seen handling an M249 SAW Para.
M249 SAW paratrooper version - 5.56x45mm
The man behind Hawkeye has an M249 Para.
Other
Airtronic RPG-7
SHIELD Director Nick Fury (Samuel L. Jackson) can be seen using an Airtronic RPG-7 launcher (a modernised US manufactured version of the RPG-7) to fire a custom warhead at a plane launching off the SHIELD helicarrier. A mercenary patrolling in Loki's underground hideout is briefly seen with one.
Airtronic RPG-7 - 40mm
Nick Fury aiming the Airtronic RPG-7 with a custom warhead.
What appears to be an MM1 grenade launcher is used by a member of the tactical team sent on a capture mission.
MM1 grenade launcher - 40mm.
What appears to be an MM1 grenade launcher is used by a member of the tactical team sent on a capture mission (this is not clearly seen in the final film).
The MM1 aimed at the house in front.
General Dynamics GAU-22/A
The SHIELD fighter plane resembling a Lockheed Martin F-35B jet is seen engaging the Hulk with what appears to be a pair of GAU-22/A 25mm guns. This configuration is very similar to the F-35B seen in the film Live Free or Die Hard. In reality, the F-35B is only outfitted with a single external gunpod. The SHIELD jet fires its twin cannons before the Hulk jumps onto the body of the jet.
General Dynamics GAU-22/A - 25mm
The SHIELD fighter plane resembling a Lockheed Martin F-35B jet is seen engaging the Hulk with what appears to be a pair of GAU-22/A 25mm guns, which appear to be firing out of the air intakes for some reason.
Grenade
Some kind of grenade is used to breach in the bridge of the SHIELD helicarrier during Hawkeye's assault.
A grenade rolling across the floor, moments before it explodes.