A Luger P08 is used by Colonel Strucker (Karel Roden) during the World War Two sequences, when he is an active duty Waffen SS Gebirgsjäger Standartenführer ("SS Mountain Infantry Colonel").
Beretta 92FS
Some of Strucker's (Karel Roden) henchmen carry Beretta 92FS pistols. Notably in one scene, a henchman on the roof carries a Beretta 92FS until he bursts onto the roof, then he is carrying a Heckler & Koch USP Compact pistol, but the gun changes back to a Beretta 92FS when he fights with Kar (Seann William Scott).
Heckler & Koch USP Compact
A henchman's gun changes to a Heckler & Koch USP Compact on the roof (which is a continuity error, see above).
Desert Eagle Mark I
Strucker's henchmen use IMI Desert Eagle Mark I pistols against the Monk (Chow Yun-Fat), who famously gets hold of them and uses them to shoot the guns from henchmen's hands.
Glock 19
Strucker's henchmen also use Glock 19 compact pistols.
Strucker's henchmen assault the Monk's building with a helicopter transporting a GE M134 Minigun. Instead of an 'acetylene' fake Minigun that has been used in other films, this is a real GE M134 Minigun, as evidenced by the loads of spent brass and belt segments flowing out of the sides.
Others
Tranquilizer Dart Gun
Nina Strucker (Victoria Smurfit) uses a modified paintball gun to fire a tranquilizer dart at the Monk (Chow Yun-Fat).
Flashbang Grenade
Strucker's assault team uses a modified flashbang grenade to attack Jade's (Jaime King) mansion.