Under Siege 2: Dark TerritoryUnder Siege 2: Dark Territory - Internet Movie Firearms Database - Guns in Movies, TV and Video GamesUnder Siege 2: Dark Territory
Casey Ryback's (Steven Seagal's) sidearm throughout the movie (which he conveniently decided to take along with him on the train) is an original Colt M1911 (not an M1911A1 as previously stated). A few of the mercenaries also carry 1911s as sidearms.
Glock 19
Most of the mercenaries carry Glock 19s as their sidearms. After killing the mercenary "Herb", Casey Ryback takes a Glock 19 off him and gives it to Bobby Zachs (Morris Chestnut) to use as a sidearm. However, he incorrectly tells Zachs that (A.) the weapon is a .45, and (B.) to take the safety off before firing. The Glock 19 is a 9mm pistol, and it has no external safety to remove before firing.
Jericho 941
A two-tone Jericho 941 ("Baby Eagle") (with a black slide and stainless frame) is carried by Marcus Penn (Everett McGill), the leader of the mercenaries.
Heckler & Koch MP5K-PDW
Almost all of the mercenaries carry Heckler & Koch MP5K-PDWs as their weapons of choice. Some have the "Navy" lower receiver, others have the older-style SEF lower (the factory MP5K-PDW only came with the Navy lower), so the latter are mock-ups. Casey Ryback also uses an MP5K-PDW (with two magazines taped together) in one scene.
Heckler & Koch MP5A5
A few of the mercenaries also carry Heckler & Koch MP5A5 submachine guns. Near the climax, Casey Ryback briefly uses one of these weapons.
A Heckler & Koch SR9(T) rifle is used by the female mercenary (Afifi Alaouie) to wound Casey Ryback from afar. This gun is actually a conversion of an HK91, like all of the SR9s seen in Hollywood movies.