Smith & Wesson M&P .40 S&W Slide Stop Assembly Used – Part# MP4027E j40u About the Model 18

About the Model 18

Part Number: 228920000

Part Number: MP4019

Professional Installation Required: Proper disassembly and reassembly by a qualified gunsmith is required

Smith & Wesson M&P .40 S&W Slide Stop Assembly Used – Part# MP4027E j40u About the Model 18Smith & Wesson M&P . 40 S&W Slide Stop Assembly Used Part Number: MP4027E Condition: Used (Factory Original) Caliber: . 40 S&W Restore your M&P . 40 to factory correct function with this genuine Smith & Wesson slide stop assembly. The slide stop locks the slide open after the last round is fired and allows the slide to be released when a fresh magazine is inserted a worn or damaged slide stop can cause failure to lock back or difficulty releasing the