Raza's Taliban fighters carry Heckler & Koch G36K rifles with C style carry handles. In the film, Tony Stark (Robert Downey Jr.) realizes that Raza's fighters have hijacked a weapons shipment from Stark Industries, and is thus better armed than any of the other factions in Afghanistan.
Heckler & Koch G36C
Several of Raza's men are also armed with the carbine G36 rifle, the Heckler & Koch G36C, also outfitted with advanced technology.
Heckler & Koch UMP45
Several of Raza's men are armed with H&K UMP45s with tactical outfitting. They are believed to be UMP45s based on the slow rate of fire compared to the fast rates of the 9mm and .40 caliber models.
SIG SG 552
One of Raza's men is seen armed with a SIG SG 552 with tactical outfitting.
CAR-15 rifle
Some of the terrorist fighters seem to carry an XM177 lookalike rifle, sometimes referred to as a CAR-15, to differentiate it from the real XM177 series of rifles.
M4A1
USAF Security forces in Afghanistan are seen armed with M4A1 rifles while in Iraq. Also used by Woodland BDU outfitted Security at the Airbase when Stark returns to the U.S.
XM-26 LSS
Held by one of Raza's men is an M4A1 with a Magpul Buttstock and a XM-26 LSS (Lightweight Shotgun System) fitted under the barrel. While the grip appear to be removed, close inspection reveals his sleave is in the way.