This 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
First seen during the weapons purchase scene, later used in the assault on Sanchez' home.
Unidentified 1911 #1
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. It looks like a Les Baer or maybe a Rock River Arms 1911 although it is hard to tell.
RPG-7
Used to blow up an SUV in the motorcade.
Sig P226
In the nightclub he carries this as his weapon.
Unknown sawn-off shotgun
Used to blow off the hand of Aurelio Sanchez. Also used in the nightclub.
M3 Greasegun
While never used on screen Creasy buys an M-3 Greasegun from the gun dealer. It's seen in his bag.