A Beretta 92 (distinguished by its rounded trigger guard and butt-mounted magazine release) is used by Sergeant First Class William James (Jeremy Renner), most prominently when James stops an Iraqi taxi. Mark Boal, the film's writer, notes on the DVD commentary the gun (the 92FS) that was supposed to be used in the scene got stuck in customs, which explains why it changes to the correct Beretta 92FS later in the film. Boal goes on to say that acquiring the 92 seen here was a difficult task; he scoured local bars, trying to find a suitable pistol, with no success. Finally, he found a Jordanian General who gave the producers the used 92 (which was then converted to blank-fire by armorer Dave Fencl).
For the rest of the film, James and Sergeant J.T Sanborn (Anthony Mackie) both use the Beretta 92FS pistol, as noted by the hocked trigger guard and slide-mounted safety. This is the gun that James was also supposed to use in the scene where he confronts the taxi driver, but it was held up in customs while that scene was shot (a Beretta 92 provided by a Jordanian General was used instead).
Error creating thumbnail: File missingBeretta 92FS - 9x19mmError creating thumbnail: File missingSgt. James draws his Beretta 92FS on an Iraqi civilian when hunting for Beckham's killer.Error creating thumbnail: File missing"Tell him to put his hands behind his head or I'll be very happy to shoot him." James radios a translator while pointing his 92FS at a man who was forced to wear a bomb vest.Error creating thumbnail: File missing"He's a dead man, James; just leave him!" Sergeant Sanborn, after trading some bolt-cutters for James' Beretta, tells him to leave the man in the bomb vest for the sake of everyone's safety.
Glock 19
A 2nd Generation Glock 19 pistol is carried by the leader of the British private military contractors (Ralph Fiennes). Sergeant J.T Sanborn (Anthony Mackie) takes the contractor's Glock and holds it on his comrades while telling them to put down their weapons. It is possible that the pistol may be a Glock 23, but this is unlikely because Hollywood's armorers tend to use mostly 9mm pistols, since until recently 9mms were the easiest caliber to convert to blank-fire.
M4A1 carbines are used by Sergeant First Class William James (Jeremy Renner), Sergeant J.T Sanborn (Anthony Mackie) and Specialist Owen Eldridge (Brian Geraghty), as well as by other American soldiers. The carbines are equipped with a variety of sights and other attachments. The sights and attachments often change too. In particular, for most of the movie, James doesn't have a light on his M4, but one appears on it during the rescue of Eldridge. Also, in one scene, Sanborn's ACOG scope is briefly replaced by a red dot sight, before switching back. A M4A1 is also used by one of the British contractors, although it is never shown very clearly. Interestingly, Eldridge's M4 appears to built on an LMT lower receiver; in the opening of the film, it's possible to read "LMT" on the magazine well.
Also note that Classic Army M15A4 airsoft carbines are also used to stand-in for the M4s during non-firing scenes (see below).
In many scenes of the movie, whenever the M4s aren't fired, they're replaced by Classic Army M15A4 airsoft replicas of the M4, which would be legal for the actors to handle without the armorer present on the set. Most of them have had their Classic Army markings covered with black magic marker or paint, but they are recognizable by their white-painted fire position markings on the lower receivers (which no real AR-15 manufacturer uses).
Note also that throughout the film, it is common to see the M4s' buttstocks change from the 4-position to the 6-position style. This is because the Classic Army M15A4 was only ever available with the 4-position stock. What this means is that all M4s seen in The Hurt Locker that have 4-position stocks are the Classic Army airsoft replicas; all of the real (blank-adapted) M4s in the movie have the 6-position stocks.
A few American soldiers carry M16A4 rifles (possibly airsoft replicas, by the unnecessary screws in the A2 stocks), fitted with reflex sights and other attachments.
A MPi-KMS 72, an East German version of the AKMS with plastic handguards and a side-folding stock, is seen slung over the shoulder of the Iraqi police officer that talks to SFC James about the car bomb at the UN compound.
Customized AKMS rifles with RIS foregrips and reflex sights are carried by most of the British private military contractors (PMCs). These appear to be the same rifles used in The Kingdom (minus the AK-74 muzzle breaks used in that film).
A Barrett M107 (not a M82 as noted by the full-length accessory rail) is used by the private contractors to respond to an insurgent ambush, and is later used by Sergeants James and Sanborn to shoot several of the attackers. It should be noted that Sanborn and the other EOD members could conceivably know how to operate this rifle since one of the M107's uses as an anti-materiel rifle is using it to destroy IED's from a distance.
File:M82A1.jpgBarrett M107 sniper rifle - .50 BMG. Note rail running full length of receiver and barrel, differentiating it from an M82A1.Error creating thumbnail: File missingThe British contractor leader (Ralph Fiennes) sets up the Barrett M107 to search for the insurgent sniper.
[[Image:THL-Barrett-2.jpg|thumb|none|600px|The PMC leader before being killed by an insurgent sniper
Browning M2HB machine guns are mounted on top of U.S Army Humvees, including that of the EOD team. It is also used by a British contractor during the ambush.
