CMC Triggers 81503 AR-15/AR-10 Lower Parts Kit with 3-3.5 lbs Single-Stage Straight Trigger

The CMC Triggers 81503 is a complete AR-15/AR-10 Lower Parts Kit built around CMC's signature Single-Stage Straight Drop-In Trigger. Designed to outfit a stripped Mil-Spec lower with every small component and fire control group needed for a fresh build, this kit centers on a CMC drop-in trigger set to a clean 3-3.5 lb pull weight with a glass-smooth break, crisp sear engagement, and a lightning-fast positive reset.

The included trigger group uses CMC's patented straight trigger shoe for a consistent, linear pull shot after shot, and installs as a self-contained, non-adjustable drop-in unit on standard small-pin AR-15 and AR-10 lower receivers. The kit fits all Mil-Spec AR-15 and M16 lower receivers, making it an easy match for a wide range of semi-auto builds on the platform.

Beyond the trigger group, the 81503 includes the full complement of lower small parts: bolt catch with plunger, spring, and roll pin; magazine release with button and spring; safety selector with detent and spring; takedown and pivot pins with detents and springs; buffer retainer and spring; trigger guard with roll pin; and an anti-walk pin set to lock the trigger and hammer pins in place under hard use. The CMC trigger comes fully assembled and ready to drop in.

Finished in black and proudly made in the USA, the CMC 81503 LPK is a clean, one-box solution for finishing a new build or refreshing a worn lower. Note: pistol grip is not included.