Smith & Wesson J Frame Mainspring Stirrup - Models 31-649 | Part 077740000

Models 31, 32, 34, 36, 37, 38, 42, 49, 60, 63, 631, 632, 637, 638, 640, 642, 649

Disassembly and assembly required to replace part. Some parts may require installation and fitting by a qualified gunsmith.

• Smith & Wesson factory replacement part

• Manufactured to exact OEM specifications and tolerances

• Same manufacturing materials as original parts

• Fits J-Frame revolvers

Swing out the cylinder and check behind the yoke on the frame for the MODEL NUMBER. Model numbers began in 1957-58. If there is no model number, your revolver may be older than 1957-58. Contact us with your serial number and we can help identify the correct parts for your revolver.