Smith & Wesson SD40 VE Locking Block .40 S&W - Part# SD40VE5 gunsmith installation Smith & Wesson M&P Shield

Smith & Wesson M&P Shield 9mm TLCI Barrel

Installation: Gunsmith installation strongly recommended

Part Number: 4502

and the non-pinned

Smith & Wesson SD40 VE Locking Block .40 S&W - Part# SD40VE5 gunsmith installation Smith & Wesson M&P ShieldSmith & Wesson SD40 VE Locking Block Part# SD40VE5 . 40 S&W Used Part The locking block is a critical frame mounted component that locks the barrel into battery during firing, absorbing the forces of discharge and ensuring proper barrel to slide alignment. A cracked, worn, or damaged locking block can cause failures to lock into battery, accuracy degradation, and in severe cases, unsafe conditions. This is a genuine S&W factory used locking block