Criminal Minds

Glock 17

Derek Morgan carries a G17 w/ flashlight attachment. Spencer Reid carried one before switching to a revolver. JJ uses it. Most FBI agents carry glock pistols. This is somewhat unrealistic since the glock 22 is standard issue.

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Springfield TRP

SSA Rossi carries a Springfield TRP throughout the series, this suggets he may have been HRT/SWAT trained to be using this weapon.

Sig p226

Gideon carried one during the seasons he was in. This is a realistic weapon since the FBI did issue the p226 after the 1076.

Smith Model 65 3'

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. One is taken by a hitman and used to kill his daughter's captor.

MP5

Used by various SWAT teams, notably in the rescue at the polygamist compound. Equipped with supressor.

S&W model 10

Reid's captor uses this pistol and later captured by reid to kill same captor.