The CMC Triggers AR-15/10 Anti-Walk Pin Set in the M&P 15-22 version is the extended-length pin set made for S&W M&P 15-22 and other composite receivers (brand part no. 91403). It uses the small .154 pin diameter, which is the diameter wider-than-standard receivers like the M&P 15-22 call for, in a longer length to span the wider receiver. Matching pin diameter and length to the receiver is the key to a clean trigger group install, and this set is sized for exactly that platform. It is a simple part for anyone fitting a drop-in trigger group in a polymer or wide composite lower.

Key Specifications

• The pin size is .154 diameter (small), the diameter CMC specifies for the M&P 15-22 and other wider-than-standard receivers.
• The pins are extended length, longer than the standard set so they span a wider receiver.
• It is made for the S&W M&P 15-22 and composite receivers, the receivers CMC singles out for this pin size.
• The set belongs to CMC’s AR-15/10 anti-walk pin line, which covers AR-15 and AR-10 pattern rifles.
• The product is an anti-walk pin set, a matched set of pins rather than a single pin.

Frequently Asked Questions

Which receivers does this pin set fit? It is the CMC extended-length set for the S&W M&P 15-22 and composite receivers, in the small .154 diameter.

Why is this set longer than the standard one? CMC explains that the M&P 15-22, or any receiver wider than standard, takes the small pin diameter but needs a longer pin length, which is what this extended set provides.

Buy the CMC Triggers Anti-Walk Pin Set for M&P 15-22

Fitting the right pin diameter and length is the difference between a smooth trigger group install and a frustrating one on a wide composite lower. Order this set from our Lubbock, Texas gun shop for fast, direct shipping, and browse more small AR-15 parts for the rest of the build.