The CMMG Lower Pins and Springs Parts Kit (brand part no. 55AFF75) rounds out an AR-15 lower build with the small hardware that’s easy to lose track of and easy to shortchange when ordering separately. CMMG is a well-known name in AR-pattern rifles and components, and this kit reflects that same attention to fit and finish. It includes two trigger pins, three trigger springs, a bolt release roll pin, a trigger guard roll pin, a bolt release detent, and two take-down pin springs with detents. Builders assembling a lower receiver from parts, or restocking hardware lost during a strip-down, will find everything needed in one package rather than sourcing pins and springs piecemeal.

Key Specifications

• Compatible with the AR-15/M16/M4 platform, covering the most common lower-receiver pattern on the market.
• Ships at approximately 6.1 inches in package length for easy small-parts storage.
• Manufactured by CMMG, a brand trusted for mil-spec-consistent AR components.
• Packaged as a complete kit rather than individual loose pieces, reducing the chance of a missing part mid-build.
• Shipping weight of approximately 0.2 pounds, reflecting the small-parts nature of the kit.
• Small-parts kit intended for a complete lower build alongside a separate trigger group and grip.
• Trusted by builders who want CMMG-branded small parts rather than generic mil-spec equivalents.

Frequently Asked Questions

What does this kit include? Two trigger pins, three trigger springs, a bolt release roll pin, a trigger guard roll pin, a bolt release detent, and two take-down pin springs with detents.

Does this include a fire control group? No — this kit covers pins and springs only, not the trigger, hammer, or disconnector.

What platform is this designed for? Standard AR-15/M16/M4 pattern lower receivers.

Buy the CMMG AR-15 Lower Pins and Springs Parts Kit

Round out your AR-15 lower build with genuine CMMG hardware built to mil-spec dimensions. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse our full AR-15 small parts selection to finish out the rest of your build.