Smith & Wesson K&L Frame Rear Adjustable Sight - Black 1.95" Old Style for 2.5" Barrels K161 SD40 The spring drives the cylinder

The spring drives the cylinder stop upward into the cylinder notches

Compatibility Note: This rebound slide is designed for K Frame Model 18-4 revolvers chambered in

these factory parts deliver the fit and finish that only genuine Smith & Wesson parts can provide

old-style design is the correct OEM fit for the J Frame

Smith & Wesson K&L Frame Rear Adjustable Sight - Black 1.95" Old Style for 2.5" Barrels K161 SD40 The spring drives the cylinderSmith & Wesson K&L Frame Rear Adjustable Sight Part Number: K161 Condition: Used Good Working Condition Finish: Black Style: 1. 95" Old Style Adjustable Rear Sight Barrel Length Compatibility: 2. 5" Barrels ONLY Compatible Models: Model 14 3, 14 4, 14 5 Model 15, 15 1 through 15 6 Model 16 3, 16 4 Model 17 3, 17 4, 17 5, 17 6 Model 18 3 Model 19 3, 19 4, 19 5, 19 6 Model 66, 66 1, 66 2, 66 3 Model 67, 67 1, 67 2 Model 586, 586 1, 586 2, 586 3 Model