The following weapons were used in the film Blue Velvet:
Smith & Wesson Model 39
Frank Booth (Dennis Hopper) uses a suppressed Smith & Wesson Model 39 semi-automatic pistol in the final confrontation between him and Jeffrey Beaumont (Kyle MacLachlan). Booth racks the slide of the Smith & Wesson every time he fires it, probably due to the suppressor which does not leave enough gas to cycle the slide.
Smith & Wesson Model 624
Colt Official Police
A Remington 870 shotgun is briefly seen in the assault on Booth's apartment.
Federal L-5 Gas Gun
A Federal L-5 Gas Gun is seen briefly being fired at Frank Booth's apartment.
Smith & Wesson Model 10
A Smith & Wesson Model 10 is seen on a TV in the opening scene.