Batman (1989)

The following guns were used in the film Batman:

Colt M1911A1

Bob (Tracey Walter) uses this gun throughout the movie on several occasions. A random goon also uses one later in the movie.

Colt M1911A1 Pistol - .45 ACP

Bob holding his Colt M1911A1

Bob holding his Colt M1911A1 on Commissioner James Gordon

Bob pointing his Colt M1911A1 at Bruce Wayne

A goon shooting at the Batmobile with a Colt M1911A1

A goon holds what appears to be a Colt M1911A1 pistol on Batman

Another shot of the goon's Colt M1911A1

Smith & Wesson 15-3

.38spl with custom 21 inch barrel. The pistol he pulls out of his pants to shoot the Batwing plane down.

Smith & Wesson Model 1

Jack Napier (Jack Nicholson) uses this as his sidearm throughout the movie. He continues to use this as the Joker.

I only remember him using it in the scene when he shoots Bruce, the bullet stopped only by a metal tray he hid under his shirt. Depsite being a little .22 pistol, the gun made the typical movie gunshot.

Colt New Service revolver

Used by Jack Napier/Joker through most of the film including the BANG flag gun at the film's climax. The only exception is one small edit when he pulls back the hammer is the Axis Chemical plant. A different pistol was used for this one shot.

Browning M1919

The guns that pop out of the Batmobile's fenders are two Browning M1919's. Seen toward the end of the movie as the Batmobile is entering the chemical plant.

GE M134 Minigun

Pops out of the Batwing plane, but is only seen for a few seconds.