[Spartan198]

I liked it, thought it was great. Anyhow, to the guns...

HK416
M4A1, M4A1 w/ M203
AA-12 shotgun
M134 minigun (both hand-held by Heavy Duty and on Black Hawk helicopters in at least one scene, but some of the footage of them helicopter-mounted looked like it came from BHD)
Five-seveN
At least 2 M1911-type pistols (possible Warrior IIs from the dark coloring and accessory rail, but couldn't see the slide or any markings clearly)
G36C
F2000 Tactical (seemed to be the standard rifle of the Joes, as there were a LOT of them)
MP7A1
Beretta 92F
Armsel Protecta (I think, but not 100%) (At first I thought they were rotary grenade launchers, as Heavy Duty was wielding two of them akimbo and blowing the crap out of Venom Troopers, so I'm figuring he was using those explosive shotgun shells, can't recall what they're called)
Fixed-stock MP5

Biggest part of Cobra's weapons were all fictional sonic wave rifles of some kind.

That's all I can remember. And sorry if any of the above seems incoherent. I'm about to fall asleep.