The Beretta 92FS is seen in the holster of U.S. Army personnel, including General Paulson (Holmes Osborne). Colonel Kerkmejian (Michael Rose) is also seen with one in the climax of the film.
SIG-Sauer P228
Henry Harold 'H' Humphries (Samuel L. Jackson) chambers a SIG-Sauer P228 when the first two FBI agents arrive to his home. Later his wife, Rina (Lora Kojovic), is seen with a P228 when the second wave of agents arrives.
Glock 17
Agent Vincent (Gil Bellows) pulls out a Glock 17 at Henry Harold 'H' Humphries' house when the FBI agents apprehend 'H'.
In the climax, Mr. Bradley (Randy Oglesby) pulls out what appears to be a Taurus Model 85. Later, Steven Arthur Younger (Michael Sheen) obtains the revolver and threatens the interrogators with it.
Shotguns
Remington 870 Entry
Agent D.J. Jackson (Brandon Routh) carries a Remington 870 when the FBI tries to apprehend Henry Harold 'H' Humphries (Samuel L. Jackson). The shotgun is fitted with rifle sights and spare shell holder on the butt-stock.
Mossberg 500
MP Winston (Dayo Ade) fires a Mossberg 500 with heat shield and fiber-optic front sight several times at the steel door when Henry Harold 'H' Humphries locks himself into the interrogation room with Younger's kids. Later, another soldier is seen with the same shotgun.
Rifles
Kalashnikov variant
In a photo, Steven Arthur Younger (Michael Sheen) holds a Kalashnikov rifle. It looks like an AKS-74 with the butt-stock folded (see plate on rear of receiver indicating it is a side folding AK variant. Since no other details are given, the default assumption is that it is an AK-74 or other side folding variant.
Colt M4A1
M4A1 rifles are used by various U.S. Army soldiers, during the evacuation as well as at the temporary Command Center set up in a school. The M4A1s are usually fitted with holographic sights, fore-grips, and weapon lights. The M4A1 of a Black Ops operative is fitted with a red dot sight in a photo.
Colt M16A2
Soldiers at the first bomb site are seen with M16A2 rifles.
Heavy Machine Gun
Browning M2HB
Browning M2HBs are seen mounted on various U.S. Army vehicles.