Smith & Wesson K, L, N Frame Revolver Stainless Steel Thumb Piece & Nut - Part KLN177 Sigma 45 ACP models is not

45 ACP models is not guaranteed due to sight dovetail and design changes

A comprehensive pin set covering every pin in the 1911 platform — ideal for a full build

Compatible with J Frame Model 38 Bodyguard Airweight revolvers

removed from a Model 13-3 revolver

Perfect Fit Guaranteed: Engineered to exact factory specifications for your K/L Frame revolver

Smith & Wesson K, L, N Frame Revolver Stainless Steel Thumb Piece & Nut - Part KLN177 Sigma 45 ACP models is notSmith & Wesson K, L, N Frame Stainless Steel Thumb Piece & Nut Keep your S&W revolver cycling smoothly with this genuine stainless steel thumb piece and nut. This old style replacement part fits all K, L, and N frame models making it one of the most versatile cylinder release components in the S&W lineup. Whether you're restoring a classic Model 10, tuning a 686, or maintaining a 629, this is the part you need. Compatibility: Smith & Wesson K Frame, L