The Recon Marines carry Beretta M9FS Pistols as their sidearms, all custom fitted with wooden grips. Beretta M9s are the standard side arm for all the Navy SEALs including Stanley Goodspeed (Nicolas Cage), all with tactical flashlight attachments.
Marines at the funeral use real M16A2 rifles for the 21 gun salute.
It is a goof that they rack the bolts to fire them as funeral guns are usually real guns fitted with a blank firing adapter on the muzzle to allow enough gas pressure to cycle the bolt(as real guns have heavier bolt springs than blank guns. Blank guns need lighter springs to allow the gas pressure to cycle low pressure blank rounds.)
The Marines can be seen armed with M16A1 rifles fitted with M16A2 forend handguards. They are easily noticed as A1 models by the lack of a shell deflector, older foward assists, and fully-automatic firing modes.
The main villain of the film, General Frank Hummel (Ed Harris) carries a stainless Springfield Armory M1911A1 as his sidearm of choice throughout the film. It is seen being pulled out by Hummel, who then shoots Sergeant Crisp during the confrontation.
Used by the Navy SEALs during the failed rescue mission of the prison. They have tactical flashlights mounted in the foregrips. John Mason (Sean Connery) uses an MP5A3 he commandeers from a dead SEAL, and uses it in the first half of the movie.
What appears to be a Deftech launcher is used by one of the Marines in the showerroom. It would be useless to use as the rounds would not detonate in such close proximity and if they did, it would be dangerous to him and his fellow men.
A Marine can be seen firing an M60E3 machine gun at Goodspeed when he disables the last rocket. Mason picks it up and knocks the shooter off the roof with it.
When the Marine's M60E3 is empty, he picks up a Barett M99 single shot .50 caliber bolt action to shoot Goodspeed. He his knocked off the roof by Mason before he can use it though.
When Goodspeed is messing around in his officer, he shoots a flip down target with a suction dart spring gun labeled "The Protector". It appears to be based off a Mossberg 500 "Crusier" with barrel ribbing.
