CMC Triggers AR-15 Lower Parts Kit – Less Trigger Assembly (81500)

Description

Building an AR-15 lower always comes down to the little stuff: the springs, detents, roll pins, and catches that turn a stripped receiver into a working platform. This kit from CMC Triggers gathers all of those small parts into one bag so you are not hunting down a missing takedown detent halfway through your build. It leaves out the fire control group and pistol grip on purpose, which makes it the go-to option for anyone who already has a favorite trigger picked out or wants to spec their own grip.

CMC has roots in aerospace manufacturing and is best known as the company behind the original drop-in precision trigger for the AR platform, so the attention to fit and finish here is no accident. Every part is built from steel and meets or exceeds mil-spec, which means it plays nice with standard AR-15 lowers and standard-size trigger groups. Builders working on .223 Remington, 5.56x45mm, or .300 Blackout lowers will find it does the job across the board since the small parts are caliber-agnostic.

What the CMC Triggers Lower Parts Kit Covers

Inside you get the bolt catch and its plunger, spring, and roll pin, the magazine release with button and spring, the buffer retainer and spring, the safety selector with its detent and spring, the trigger guard and roll pin, and the full set of takedown and pivot pin hardware with detents and springs. That is everything on the lower except the trigger, hammer, and grip.

Why Builders Reach for This CMC Kit

Feedback from folks who have run this kit points to clean, well-finished parts that fit together without a fight, with the mag catch and roll pins going in smoothly. It works just as well as a spare-parts stash to keep on the bench for repairs down the road. Pair it with a CMC drop-in trigger and a grip you like, and you have a lower ready to assemble.