After embarrassing a patient at the beginning of the movie, Henry (Thomas Jane) almost shoots himself with a Smith & Wesson Model 19 Snub Nose revolver. Instead, he accidentally discharges it into his diploma on the wall.
M1911A1
An engraved, nickel-plated, ivory-gripped M1911A1 is used by Colonel Curtis (Morgan Freeman) and later by Lieutenant Owen Underhill (Tom Sizemore). Curtis claims it was a gift from John Wayne. Henry (Thomas Jane) is also seen briefly handling the pistol. Fun Fact: This particular pistol went on to be the sidearm of Dean Winchester (Jensen Ackles) in the TV series Supernatural.
SIG-Sauer P226
Colonel Curtis (Morgan Freeman) carries what appears to be a SIG-Sauer P226 in a shoulder holster. In a deleted scene, he is seen pulling it when a soldier attempts to stop him from taking off in a helicopter.
Beretta 92FS
A Beretta 92FS pistol can be briefly pulled by a truck driver (Ty Olsson) when confronted by Jonesy.
Submachine Guns
Heckler & Koch MP5A3
A Heckler & Koch MP5A3 is used by Lieutenant Owen Underhill (Tom Sizemore) to stop COL Curtis and later by Henry to kill a "Shit Weasel".
Note: In the book, Jonesy used a M1 Garand instead of a Winchester.
Colt AR-15A2 Target Custom
Colonel Curtis (Morgan Freeman) briefly uses a Colt AR-15A2 Target with a 24" barrel, free-floating aluminum hand guard, Bell & Carlson thumbhole stock, bipod, and AN/PVS-4 Night-vision scope. This exact same rifle has appeared in several episodes of The Outer Limits, The X-Files, The Sentinel, and a number of other movies and TV shows filmed in British Columbia.
Ruger M77
Beaver (Jason Lee) can be briefly seen carrying a Ruger M77 rifle when he gets back to the cabin.
M16A2
M16A2 rifles seem to be carried by some of the U.S. Army's 'Blue Unit' soldiers.
M4A1
The M4A1 carbine can be briefly seen being carried by some soldiers.
Heavy Weapons
M134 Minigun
An M134 Minigun is mounted on Colonel Curtis's AH-6 "Little Bird" helicopter.
M230 Chain-Gun
M230 Chain Guns mounted on AH-64 Apache attack helicopters are seen being fired during a Blue Unit air assault.