Criminal Minds

Glock 17: Derek Morgan carries a G17 w/ flashlight attachment. Spencer Reid carried one before switching to a revolver. Most FBI agents carry glock pistols.

Colt Government model: Agent David Rossi carries a colt 1911.

Sig p226: Gideon carried one during the seasons he was in.

Smith Model 19: Reid switches to one in season 4.

Beretta 92: Used by criminals and police.

Ar-15 variants: Swat teams from the FBI and several local police forces have m4 carbines. A milita member uses a colt commando with a red dot attachment. A killer guns down 3 of his enemies with a fully automatic AR, possibly class 3 or illegally converted since it is described as privately owned. A shooter uses a scoped AR-15 from the trunk of a car, aiming to wound so he can attend to wounds as part of a hero complex. Reminiscent of D.C. sniper incident.

Mac-10 A bank robber uses a mac 10, incorrectly calling it an uzi.

m26 hand grenade: A milita member suicide bombs himself with one, killing a police officer.

Ak variants: Members of a polygamist cult use Ak variants in a shootout with a SWAT team. The leader fires an AKM in the air for attention later. A somalia vet sees milita with various aks, but it's in his mind, they are really swat officers with m4 carbines.

Remington 870: used by "road warrior" killer, fired from inside car.

various unknown pistols. Criminals in one used .22 automatics to kill innocents. Multiple revolvers are used, quite frequently over semiautos. Agent hotchner carries a small BUG in an ankle holster, a automatic.