Sonny Wortzik (Al Pacino) uses a M1 Carbine as his main weapon during the bank robbery, sometimes handing it off to Sal when he would go to talk to the police outside. Since Sonny was a Vietnam veteran, it is possible this was an artifact from his war years. Several NYPD officers surrounding the bank also carry M1 Carbines, some with extended 30-round magazines.
Winchester Model 70
Some of the NYPD officers are armed with Winchester Model 70 rifles, with and without scopes.
unidentified rifle
An NYPD sniper aims a rifle at Sonny and Sal as they leave the bank.
An NYPD uniform officer carries a Stevens 520 pump shotgun
unidentified shotguns
Some of the NYPD officers carry shotguns during the bank siege.
Revolvers
Colt Official Police
Sonny and Sal's partner Stevie (Gary Springer) carries a Colt Official Police during the bank robbery but hands it to Sonny when he realizes he can't go through with it.
Colt Detective Special
Some of the NYPD officers, notably the plainclothes detectives, carry Colt Detective Specials.
Smith & Wesson Model 36 Chiefs Special
FBI Agent Murphy (Lance Henriksen) draws what appears to be a Smith & Wesson Model 36 Chief's Special from a hidden compartment in the airport car in the finale. It looks to be the smaller framed J Frame rather than the mid-sized Model 10.
unidentified revolvers
The NYPD carry revolvers as they wait outside the bank for Sonny and Sal to emerge.