CMC Triggers | AR-15 LPK w/ Flat Single-Stage Trigger | 81503

This CMC Triggers lower receiver parts kit provides the core internal components needed to finish a small-pin AR-15 lower. It is supplied with a flat, single-stage trigger and an enhanced trigger guard, and the components are described as meeting or exceeding MIL-SPEC. The kit is intended for builders assembling or refreshing AR-15 lowers; a pistol grip is not included.

Common applications include custom AR-15 builds for the range and precision practice, and parts replacement during routine maintenance or upgrades.

Product Specifications

• The manufacturer is CMC Triggers.
• The product type is a lower receiver parts kit for AR-15.
• The kit includes a single-stage flat trigger (see notes regarding reported pull weight).
• The manufacturer part number is 81503.
• The UPC is 859464006017.
• The kit fits small-pin AR-15 lowers (.156 inch pin).
• The listed materials are steel and aluminum.
• Included components are bolt catch, bolt catch plunger and spring, bolt catch roll pin, mag release and button, mag release spring, buffer retainer and spring, safety, safety detent and spring, trigger guard and roll pin, takedown detents and springs, takedown pins, and the trigger.
• The kit does not include a pistol grip.
• The finish/fitment is reported as small pin AR-15.
• Product dimensions are listed as 1.15 x 5.30 x 8.80 (source values as provided).
• The listing states that parts meet or exceed MIL-SPEC.
• This item is designated as an AR-15 accessory: Yes.

This kit supplies the essential lower parts for an AR-15 build or service project while delivering the consistent feel of a single-stage flat trigger and an enhanced trigger guard. It is a straightforward choice for builders who want a complete lower-parts set with quality components that are described as meeting MIL-SPEC standards. Note that the pistol grip is not included, and the kit is tailored for small-pin lowers.