Whiteout

Glock 26

U.S. Marshal Carrie Stetko (Kate Beckinsale) uses a Glock 26 throughout the movie, usually keeping it a safe. Oddly when she initially removes it from the safe, it's a Glock 19. She later loses it when it's kicked away by the killer. Due to the weather, and the fact she was under attack, it was unrecoverable. She also uses it during the flashback sequences.
It may be noteworthy, but while Kate appears to have an adequate grip, she doesn't properly compensate for her left eye dominance, which leads to an unstable stance.

Glock 26 - 9x19mm

Stetko's Glock 26 holstered in the safe.

Stetko holding her weapon on Richard Pryce (Gabriel Macht).

Stetko going for her weapon before it get's kicked away by the killer.

Glock 19

When Carrie Stetko removes her sidearm from the safe, it has oddly changed to a Glock 19. During the flashback sequences, Stetko's partner Jack (Joel S. Keller) is seen with a Glock 19.

Glock 19 (2nd Generation) - 9x19mm

Stetko's Glock 26 has changed to the larger Glock 19.

Beretta 92FS

U.N. Agent Richard Pryce (Gabriel Macht) uses a Beretta 92FS to defend himself.

Beretta 92FS - 9x19mm.

Sa.25

An Sa.25 Czechoslovakian submachine gun is used by one of the Russian guards during the opening scenes of the film.

File:CZ Sa. 24 submachine gun.JPG

Czechoslovakian Sa.25 (a 7.62x25mm version of the Sa.23) submachine gun.

A Sa. 25 next to it's sleeping owner.

Makarov PM

A Makarov PM is used by the bald guard in the opening scene.

Makarov PM - 9x18mm Makarov

The bald guard with his Makarov PM.

Tokarev TT-33

A Tokarev TT-33 is used by Russian guards during the opening scenes.

Tokarev TT-33 - 7.62x25mm Tokarev.