12 Rounds

The following guns were used in the film 12 Rounds:

Beretta 92Fs Inox

Det. Danny Fisher (John Cena) is seen using a Beretta 92FS Inox while on duty as a police officer.

Beretta 92FS Inox - 9mm.

Officer Danny Fisher with his Beretta 92FS Inox at the ready.

Smith & Wesson 6906

Det. Danny Fisher (John Cena) is seen in promotional images carrying a Smith & Wesson 6906. It can be assumed this is his main sidearm in the film.

Smith & Wesson 6906 - 9mm.

Danny Fisher armed with a Smith & Wesson 6906.

Desert Eagle

Danny Fisher (John Cena) uses a Desert Eagle.

I think this is a lie (possibly a joke) since the desert eagle is obviously not the only gun in the film. - Gunmaster45

I didnt see one in the movie. The Winchester

Golden Desert Eagle - .50 AE.