Smith & Wesson J Frame Model 640 Thumb Piece & Nut Stainless Steel .38 Special Old Style Used 640181 Model 457 potentially damaging your barrel threads

potentially damaging your barrel threads or coming loose during use

Precision-manufactured to exact Smith & Wesson specifications using the same materials and tolerances as original equipment

this spring delivers improved feeding and consistent performance shot after shot

Standard Weight Design: 11lb spring weight optimized for factory ammunition and reliable function

Smith & Wesson J Frame Model 640 Thumb Piece & Nut Stainless Steel .38 Special Old Style Used 640181 Model 457 potentially damaging your barrel threadsSmith & Wesson J Frame Model 640 Thumb Piece & Nut Genuine Smith & Wesson factory thumb piece and nut assembly for J Frame Model 640 revolvers chambered in . 38 Special. This stainless steel component is an authentic old style used part in good working condition. Key Features: Stainless steel construction for durability and corrosion resistance Old style factory configuration Fits Smith & Wesson J Frame Model 640 . 38 Special revolvers Genuine S&W