The Beretta 92FS with a two-tone slide is carried by rookie cop Bashira Kincaid (Clea DuVall).
Beretta 92FS
A Beretta 92FS is taken off a possessed prisoner and then is seen in the hands of another one during the final shootout.
SIG-Sauer P228 (Customized)
Michael Descanso (Liam Waite) carries a two-tone SIG-Sauer P228 with a black added on compensator as his sidearm. This also appears to be the sidearm of Sgt. Jericho Butler (Jason Statham). These custom pistols appear to be the same ones that were originally modified for the 1995 film Virtuosity.
Near the end of the film, James 'Desolation' Williams (Ice Cube) and Lt. Melanie Ballard (Natasha Henstridge) can be seen holding nickel Franchi LF-57s. These were the semiautomatic civilian guns that were imported into the U.S. starting in 1962. The ones in the film were converted to full auto fire prior to the MG ban of 1986. These submachine guns appear to be the ones previously seen in the 1998 film Soldier.
Shotguns
Franchi SPAS-12
Commander Helena Braddock (Pam Grier) carries the Franchi SPAS-12 shotgun in the initial scenes of the movie. She only fires it in an attempt to open a jeep's door. In the final shootout with the infected, the Franchi is used by Officer Bashira Kincaid (Clea DuVall) and James 'Desolation' Williams (Ice Cube).
Valtro PM5 (Custom)
The Valtro PM5 Shotgun is used by members of the Mars Police including Lt. Melanie Ballard (Natasha Henstridge), Bashira Kincaid (Clea DuVall) and Michael Descanso (Liam Waite). James 'Desolation' Williams also holds the shotgun. These shotguns have a pistol grip, a muzzle brake attached and some sort of spear protruding beneath the muzzle, as well as a pump-fixed C-More Red Dot Sight above it.
Remington 870 (Custom)
A pistol-gripped Remington 870 fitted with a TacStar vertical foregrip, heatshield, and side-saddle spare shell holder is carried by Dr. Arlene Whitlock (Joanna Cassidy) in the final shootout. This 870 is an identical configuration to the one seen in the film Natural Born Killers (possibly the same weapon).
Remington 870 (Short Barrel)
A custom Remington 870 is seen in the hands of Uno (Duane Davis) and by James 'Desolation' Williams. The shotgun has a shortened barrel and also a pistol grip.