Green Zone is a 2010 Iraq War thriller set in Baghdad a few months following the US invasion. Matt Damon stars as Roy Miller, a US Army Chief Warrant Officer in charge of a MET-D unit tasked with locating WMD throughout the country. When numerous sites come up empty, Miller ventures into the "Green Zone" of safety in Baghdad to find out from the CIA why. The film marked the third collaboration between director Paul Greengrass and Matt Damon (following The Bourne Supremacy and The Bourne Ultimatum) and is notable for the fact that most of the actors portraying the MET-D team were actual veterans of the wars in Iraq and Afghanistan, which is a plus for realism and also explains the excellent weapons handling throughout the film.
The following weapons were used in the film Green Zone:
Chief Warrant Officer Roy Miller (Matt Damon) carries a Beretta 92FS as his sidearm, but doesn't use it in the film. He is also threatened with a Beretta after he is abducted by men with General Al-Rawi (Yigal Naor). Freddy (Khalid Abdalla), an 'asset' working for the Americans, also uses a Beretta towards the end of the film.
Glock 17
Members of Miller's Mobile Exploitation Team - Delta (MET-D) unit appear to use Glock 17 pistols as their sidearms. Some Green Zone security guards also have Glocks in their holsters, while Major Briggs (Jason Isaacs) has a Glock holstered on his tactical vest.
Submachine Guns
Heckler & Koch MP5A3
Major Briggs (Jason Isaacs), an American Special Forces officer, uses a Heckler & Koch MP5A3 with RIS handguard, Surefire weaponlight and an ACOG scope as his primary weapon.
Heckler & Koch MP5A2
Heckler & Koch MP5A2s are used by the private military contractors guarding Iraqi and American officials.
Rifles/Carbines
Norinco Type 56-1
Norinco Type 56-1 AK rifles, distinguished by their hooded sights and handguards, are used by most of the Iraqi gunmen. Roy Miller takes one from his captors and uses it when he attempts to track down General Al-Rawi during a battle between Iraqi insurgents and American special forces soldiers.
M4A1 Carbine
Miller and some of his men use M4A1 carbines with a variety of different sights and attachments. Miller's M4A1 is fitted with an ACOG sight and a flashlight.
The M4s in the movie all have A1-style lower receivers with the older-style 2-position collapsible buttstock, which means that they're actually M4 uppers on lower receiver units taken from older-model CAR-15 variants (the genuine mil-spec M4 was only ever available with the A2-style lower receiver and 4-position and later collapsible stock).
M16A2
M16A2 rifles are used by various American soldiers throughout the film. Wilkins (Jerry Della Salla) uses an M16A2 with an Aimpoint red dot optic mounted on the carry handle.
M16A4/M203 (G&P airsoft replica)
One of the 101st Airborne troopers sent to assist Miller's MET-D unit uses what appears to be an M16A4 with an M203 grenade launcher. This is actually a G&P airsoft replica, as evidenced from the obvious G&P Marine EV trademarks visible on the lower receiver well.
Special Forces custom CAR-15s
Most of the Special Forces soldiers are armed with CAR-15-type carbines fitted with various accessories, including M68 Aimpoint red dot scopes and Surefire Universal weapon lights. A close inspection reveals that many of the non-firing CAR-15s used by the operators are actually Classic Army XM177 airsoft replica rifles. The firing weapons appear to be Colt Model 733s (or some other variant) fitted with XM177 flash hiders. It seems unusual that a well-equipped SF unit would be using such outdated AR-type rifles in 2003, especially since Miller's unit carries the more modern (and correct) U.S. military-standard M4 Carbine.
Machine Guns
FN Minimi (mocked up as M249 SAW)
One of Miller's MET-D soldiers is armed with the M249 SAW. The weapon actually appears to be a standard FN Minimi that has been given an M249-style stock and heat shield (its front hand guard and carry handle are the wrong type for a genuine M249).
Browning M2HB
The Browning M2HB is seen mounted on Humvees throughout the film.
Sniepr Rifles
Remington 700
One of Miller's C-BIST team is armed with a Remington 700 sniper rifle painted in desert camo, standing in for a US Army M24 sniper rifle. The rifle appears to have a fluted barrel and tactical-style stock with adjustable butt. This rifle is in reality, as many others in the movie, an airsoft replica from Classic Army (Airsoft HK Brand) due to tape covering the airsoft mag.
Other
RPG-7
Iraqi insurgents use a RPG-7 to shoot down an American Blackhawk.
Ottoman Muskets
Several Ottoman Muskets can be seen in the house of one of Al-Rawi's commanders when the MET-D unit raids the house.