Chief Jeff Talley's (Bruce Willis) personal sidearm is a Kimber Custom TLE II .45 caliber handgun. He is seen with it tucked as a belly gun in the opening standoff and uses it in the end to save his family. Clear shots can be seen showing Kimber's scripture writing on the gun. On the other side, a clear shot can be seen reading "LAPD SWAT CUSTOM", which makes sense as LAPD SWAT teams use Kimber Custom IIs. In addition to its accurate use in the film, the Kimber is shown firing an accurate eight rounds in the film's climax.
Glock 26
A Glock 26 is used by Chief Jeff Tally (Bruce Willis) as his backup weapon. He keeps a rubber band tightly wrapped around the grip for a better grip on the gun. The gun is classified as a Glock 26 based on its 10+1 capacity accurately depicted. The 26 is also seen in the hands of Walter Smith (Kevin Pollak)
Glock 21s are carried by Bristo Camino Police Department Officers including Jeff Talley (Bruce Willis) when in uniform.
Beretta 92FS Two-Tone
A Beretta 92FS with a two-tone finish is locked in the safe at the home.
Colt Python
The Watchman (Kim Coates) is armed with a nickel plated Colt Python with wood grips.
Heckler & Koch USP Expert
One of the hostage takers is armed with an H&K USP Expert in .45 ACP and uses it to hold up Talley in his police van.
Glock 34
A "practical-tactical" Glock 34 is used by Mr. Jones (Johnny Messner), the lead counterfeit FBI SWAT member.
SIG-Sauer P220 Sport
One of the hostage takers is seen using a stainless SIG-Sauer P220 Sport pistol.
Smith & Wesson Model 19
The disgruntled father in the opening standoff is armed with a Smith & Wesson Model 19 revolver with a four-inch barrel.
Shotguns
Mossberg 590
A Mossberg 590 with ghost ring sights is used by Chief Tally to breach the door to enter the home. He also uses it to blow out the glass water fall to temporarily douse the flames. Fitted with Ghost Ring peep sight.
Submachine Guns
FN P90
Mr. Jones also uses an FN P90 during the mansion shootout.
Heckler and Koch MP5A3
Heckler and Koch MP5A3s are used by some of the fake FBI SWAT members. One is set aflame by Mars.
Rifles
M40A1
M40A1s are seen used by police snipers during the opening standoff.
M40A3
M40A3 Sniper Rifles are used by police snipers (including the former LAPD SWAT Peter Weireter) to shoot out the security cameras of the house. They are identified as A3s because of their bipods, scope types, and heavy barrels.
M4A1 Carbine
LAPD SWAT officers in the opening standoff are seen using M4A1 rifles. Also seen used by one of the fake FBI SWAT members that is set aflame by Mars.