One of the commando carries a Walther P99 which we most notably seen when the commandos storm the mansion in the beginning of the movie. It could also be Smith & Wesson SW99, but I don't know for sure.
Definitely a P99 - 'squared' trigger guard as compared to the SW99's rounded one.
Rain Ocampo (Michelle Rodriguez) uses a Springfield Armoury Mil-Spec M1911A1 with Pachmayer grips and an accessory rail as her sidearm. This weapon is also shared between the characters, specifically Alice (Milla Jovovich), when all of their other weapons run out of ammunition. Matt (Eric Mabius) can also be seen trying to draw a Springfield Armory M1911A1 on the commandos in the beginning of the movie before it is taken away from him.
J.D. Salinas (Pasquale Aleardi) uses a Smith & Wesson 5906 as his sidearm. He also uses this weapon to shoot a zombie two times in the knee caps and three shots to the chest before Rain unloads her MP5K and sends it flying unrealisticly.
J.D. Salinas (Pasquale Aleardi) uses a Heckler & Koch G36K as his primary weapon. One (Colin Salmon) also carries a G36K. All of the folding stocks have been removed and replaced by tactical reciever endcaps..
In the movie, you can see One also shouldering his G36 by the AG36's pistol grip. It is a very incorrect way to hold this kind of weapon. Unless someone can point out how tactically sound it is.
Alice (Milla Jovovich) grabs a Hi-Standard K-200 20 gauge riot/self defense shotgun with rifle sights out of a police car in the abandoned streets at the end of the film.
