SKU: CMC91403
UPC: 850544004923
MPN: 91403
The CMC Trigger Anti-walk Pin Set for S&W M&P15/AR15 Polymer Lowers is a precision component designed to eliminate a critical reliability issue in modern sporting rifles. The anti-walk pin prevents the hammer and trigger pins from backing out during extended shooting sessions—a problem that has plagued countless shooters running polymer lower receivers. Whether you're building a duty rifle, competition platform, or home-defense AR, this pin set addresses a known mechanical weakness that can result in catastrophic firearm malfunction under stress.
CMC Triggers engineered this solution with a spring-loaded detent mechanism that positively locks pins in place while allowing normal trigger group installation and removal without special tools. The design works seamlessly with S&W M&P15 and standard AR15 polymer lowers, where the softer material provides less friction retention than aluminum. By applying controlled pressure against the pin heads, the anti-walk system prevents micro-movement caused by recoil impulses, vibration, and thermal cycling—the exact conditions that cause traditional pins to migrate outward and fail. The compact footprint and lightweight construction add zero ergonomic burden to your rifle while delivering mission-critical reliability.
Law enforcement and military operators who field polymer-lower ARs have made this upgrade a standard practice, and civilian shooters running high-round-count training sessions will see immediate benefit. Installation requires only removal of your existing trigger group pins—no drilling, fitting, or permanent modification to your lower receiver. Compatible with all S&W M&P15 variants and any AR15 pattern polymer lower with standard pin dimensions, this set represents affordable insurance against trigger group failure during critical moments. Weighing just 0.05 lbs and occupying minimal space in any maintenance kit, the CMC anti-walk pin set delivers veteran-grade reliability for shooters serious about firearm consistency.
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