The following weapons were used in the film Barton Fink:
12 Gauge Sawed off Double Barreled Shotgun
When confronted at the hotel by a pair of detectives, Charlie Meadows (John Goodman) pulls out a 12 Gauge Double Barreled Shotgun and chases after them while the hallway catches fire.
The shotgun is taken from the case.
Colt Detective Special
Detective Mastrionotti (Richard Portnow) pulls a nickel Colt Detective Special when confronting Charlie.
Colt Detective Special Nickel - .38 Special