The Glock 34 in 9x19mm is Creasy's sidearm in the beginning, carried in a Kydex OWB holster. It is the weapon with which he attempts suicide and later uses in the kidnapping scene.
Glock 17
Creasy later carries another Glock, the Glock 17. Used when he kidnaps his first revenge victim, and when he assaults the motorcade and kidnaps the police captain. Later given to Mr. Ramos to kill himself with.
Browning Hi-Power
Creasy examines a Browning Hi-Power during the weapons purchase scene, but this gun is not seen since.
Colt Commander 1911
A Colt Commander is seen during the weapons purchase scene, and later used in the assault on Sanchez' home.
Colt Gold Cup National Match Pistol
A Colt Mark IV Series 70 Gold Cup National Match is used to kill the first police officer, who claimed himself as part of the Mexico City Police Department criminal secret society named "La Hermandad", after being tortured.
Unidentified 1911 #2
Used by Daniel Sanchez' brother to shoot Creasy in the chest before attempting to escape. It is hard-chromed or stainless steel, has ivory grips, slanted rear serrations and possibly front serrations as well.
Looks like a Auto Ordnance M1911A1 to me as I think that is a shadow on the front of the slide - Phoenixent