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The following weapons appear in the film Avatar:

Avatar (2009)

Modified M60 machine gun

A modified M60 machine gun is used as a doorgun on the SA-2 Samson tiltroters helicopters, and as a assault rifle by ten foot tall Avatars. The weapon uses a detachable drum magazine instead of a ammo belt.

M60 machine gun 7.62x51mm NATO

A behind the scenes still of the M60 modification.

Director James Cameron handles the modified M60 in a behind-the-scenes shot.

While in his Avatar, Jake Sully (Sam Worthington) fires the modified M60 when traped by a Thanator.

Jake use one during the areal battle but drops it to arm hand grenade

Norm Spellman also use one in the final battle.

Modified unknown Bullpup rifle

Seen used by the RDA SecFor on Pandora in the trailers. According to the "Human Hardware" featurette the weapons are made by the fictional company "MATANZA ARMS CORP.". The props, realized by Weta Workshop, have been build in at least 2 variants: the Standard Issue Rifle and the Personal Defence Weapon. From a closer inspection of the weapons, it appears that the rifles are built around either the Ruger AC-556 series automatic rifles or the M14 rifle (note the ejection ports on the rifles in the picture below).

some rifles look like they have under-barrel attachments that could be a shot gun or a grenade launcher. they were never fired during the film.

Modified unknown Bullpup pump-action shotgun

Seen used by RDA operatives in the trailers.

It looks like a Steyr AUG

Modified handgun/SMG

Seen used by a SecFor member before he is pulled off the gunship. A major handguard has been added to the actual weapon.

A SecFor member fires before he is pulled off a dropship by a Mountain Banshee.

Jake Sully (Sam Worthington) use a handgun during the Avatars team escape from the Colony

Modified General Dynamics GAU-19/A

The GAU-19 is seen used as door guns on the Aerospatiale SA-2 Samson, and on the Valkyrie that is used as a bomber. Trudy's Samson, had two auto fired during the battle for the tree of souls.

A doorgunner firing a modified GAU-19 from a SA-2 Samson tiltroter helicopter.

Custom Break-open Revolver

Seen in the hands of Colonel Quaritch (Stephen Lang) in promotional stills. Also used by him in the movie when he tries to stop the fleeing Samson helicopter.

Colonel Quaritch

Flamethrower (Chem/Term Incinerator)

Prop seen in the "Human Hardware" featurette. According to the "Pandorapedia", a similar but bigger weapon would be an optional equipment for the AMP suit.

used briefly by a mercenary to burn plant life

fictional 30mm autocannon the "GAU-90"

carried like rifles by the AMP suits. Col. Miles Quartich (Stephen Lang) and Cpl. Lyle Wainfleet (Matt Gerald) use GAU-90's on their suits during the final battle.

Cpl. Lyle Wainfleet (Matt Gerald) aims his GAU-90 at the charging Na'vi.