CMMG AR-10 ZEROED Lower Parts Kit, Mk3

CMMG AR-10 ZEROED Lower Parts Kit, Mk3 Overview

Ready to complete your AR-10 or LR-308 lower receiver? The CMMG AR-10 ZEROED Lower Parts Kit, Mk3 delivers everything you need to finish your .308 WIN build with premium, USA-made components. This complete lower parts kit is designed to work with CMMG Mk3 lowers and most Gen 1 DPMS High-Pattern LR-308 receivers, giving you the confidence that every part meets or exceeds mil-spec standards.

What sets the CMMG AR-10 ZEROED Lower Parts Kit, Mk3 apart is the upgraded ZEROED components included throughout. You get the adjustable 60°/90° ambidextrous safety selector, extended bolt catch with oversized paddles, ambi magazine catch, and extended magazine release button. The HD pivot and takedown pins feature a slightly longer design with divoted ends for easy tool-free disassembly. All components come organized in color-coded packets for quick identification and frustration-free assembly.

The CMMG AR-10 ZEROED Lower Parts Kit, Mk3 includes your complete fire control group (trigger, hammer, disconnector with springs), all necessary pins, springs, detents, and a ZEROED pistol grip with hardware. Whether you’re building a .308 rifle or AR-10 pistol platform, this kit provides a solid foundation. Just add a buttstock or brace kit to complete your lower group.

What’s Included in the CMMG AR-10 ZEROED Lower Parts Kit, Mk3

ZEROED Extended Bolt Catch Assembly
The CMMG ZEROED extended bolt catch features dual oversized extended paddles with a tactile machined surface for confident operation. Steel construction with a durable finish ensures years of reliable use. Kit includes bolt catch, plunger, spring, and screw pin.

Fire Control Group
A complete single-stage fire control group with trigger, trigger spring, hammer, hammer spring, disconnector, disconnector spring, and trigger/hammer retaining pins. All components are manufactured to meet or exceed military specifications.

ZEROED 60°/90° Adjustable Ambi Safety Selector
This ambidextrous safety selector features a reversible barrel that allows for either standard 90° or short throw 60° travel. Stylized lever serrations provide confident operation and a striking design. Includes detent and spring.

ZEROED Ambi Magazine Catch System
The CMMG ZEROED ambi extended mag catch brings ambidextrous operation along with an extended-release bar that gives shooters more leverage for faster reloads. Kit includes the ambi magazine catch, spring, and ZEROED extended magazine release button.

Mk3 HD Pivot and Takedown Pins
These improved pins are slightly longer than standard to make takedown faster and easier. The ends feature a divot that allows for the use of a bullet tip without the fear of slipping. Includes both pins with detents and springs.

ZEROED Pistol Grip and Buffer Components
A ZEROED pistol grip with grip screw and washer provides a solid interface for control. Buffer retainer and spring round out the kit to complete your Mk3 lower receiver build.

CMMG AR-10 ZEROED Lower Parts Kit, Mk3 FAQ