Smith & Wesson M&P 9 Locking Block Pin 9mm Used OEM Part MP904B

Smith & Wesson M&P 9 Locking Block Pin — Used OEM Factory Part

Part #: MP904B | Fits: M&P 9 (Full-Size, 9mm)

This is the locking block pin that fits through the frame and secures the trigger components inside the M&P pistol frame. A critical structural component for proper trigger group retention.

• Smith & Wesson factory OEM part
• Manufactured to original S&W specifications and tolerances
• Used surplus part in good working condition
• Fits: M&P 9 full-size (9mm)

Installation Note: Disassembly and reassembly of the pistol is required to replace this part. Installation and fitting by a qualified gunsmith is recommended.

Questions? Call or email us — we're happy to help confirm fitment before you order.