User blog comment:Alex Martin Rider/Spec Ops weapons/@comment-1773767-20100808040552

Mine would be:

Assault Rifles: M8A2 (XM8 in production and fixed), M4A1, M16A4, ARX-150, AUG A3, M468 upgrade (a removable reciever attachment to make M4/M16 chamber a .50 cal round), G11, FAMAS, SCAR-L & H

SMG: UMP-45, Bizon, MP7, MP5, MP5K, Colt 9mm SMG.

MG: M249 SAW, L85 LSW, M60E4, MG3, MG4

Shotguns: M1014, W1200, SPAS-12, Mossberg 500, AA-12

Sniper Rifles: Barret M82, M14 EBR, M40A3

If you don't know what some are, just ask.