The U.S is using the M16A2 A3 and A4, M4, HK416, Many other types of AR platforms like the Colt Commando ,SCAR-L, SCAR-H, the M60E4, M249, M240, MK46, MK48, MK19, M2, the AS50,M24, M40, M-14, M21, M25, M86, M107, M110, MK14, M39, MK12, M1A1, DMR and other designated marksmen rifles, the MP5 (SD&K), the M9, M11, M1911A1 clones, the Mossberg 590, M1014, R870, M26, the M203, and the M134 and GAU-17. Italy uses the AR 70/90 and the M12. Germany uses the G36, the MG-3 and MG-4. France uses the FAMAS and AA-52. Many other countries fighting in Iraq also share these weapons and have even more. The insurgents use the AKM, AKMS, AK-74, AK-74S, AK-74SU, SKS, the SVD, Mosin-Nagant, the RPD, RPK, PKM and the RPG-7
hope this helps ^-^