CMMG MK3 Enhanced Ambidextrous Lower Receiver Parts Kit for LR-308

Building a modern sporting rifle from the ground up doesn't have to mean hunting through a parts catalog or guessing which components work together. The CMMG MK3 Enhanced Ambidextrous Lower Receiver Parts Kit for LR-308 gives you everything needed to assemble a complete, functional lower receiver in one organized package. Designed for shooters who value ambi controls and straightforward builds, this kit is compatible with CMMG MK3 lowers and most LR-308 type receivers, making it a solid choice whether you're upgrading an existing platform or starting fresh.

What sets this kit apart is the thoughtful organization: color-coded packets keep each component grouped logically, so assembly flows smoothly without the frustration of sorting parts across a workbench. You get the critical pieces—bolt catch assembly, trigger group, hammer assembly, safety selector, magazine catch mechanism, and pivot/takedown pins—all specified and ready to go. The enhanced ambidextrous safety means left and right-handed shooters can operate the rifle confidently without fumbling for controls.

This is an ideal solution for builders who want quality components from a brand known for LR-308 platform expertise, without overpaying for pre-assembled uppers or complete rifles. Whether you're building a dedicated precision rig, a multipurpose hunting platform, or adding a spare lower to your arsenal, the kit streamlines the lower assembly stage and lets you focus on the rest of your build.

Key Features

• Complete lower receiver parts assembly—no hunting for scattered components
• Color-coded packet organization for faster, more intuitive builds
• Enhanced ambidextrous safety selector for left and right-handed shooters
• Includes all trigger group, hammer, bolt catch, and retention components
• Compatible with CMMG MK3 and most LR-308 type lowers
• Magazine catch, pivot pins, takedown pins, and all springs and detents included

Specifications

Brand	CMMG
Platform	LR-308
Receiver Type	Lower Receiver Parts Kit
Safety	Ambidextrous
Grip Style	A2-style
Contents	Complete lower parts group: bolt catch assembly, trigger group, hammer assembly, safety selector with detents and spring, magazine catch, pivot/takedown pins with detents and springs, grip and screws

Frequently Asked Questions

Is this kit compatible with my LR-308 lower?

The CMMG MK3 Enhanced kit is designed for CMMG MK3 lowers and most LR-308 type lower receivers. If you're building on a different platform, verify compatibility with your specific lower before ordering.

What's included in this parts kit?

You get a complete lower parts group: bolt catch assembly (with screw-in pin, plunger, and spring), trigger and disconnector groups with their springs, hammer and hammer spring, trigger/hammer retaining pins, ambidextrous safety with detent and spring, magazine catch with spring and release button, pivot and takedown pins with detents and springs, and an A2-style pistol grip with screw and washer.

Do I need any other parts to assemble the lower?

This kit contains all the internal and control parts needed for a functioning lower receiver. You'll still need to source your lower receiver itself, and any stock or buffer tube assembly if not already installed on your receiver.

Why are the parts color-coded?

The color-coded packets organize components by function and assembly stage, making it easier to keep track of parts during the build and reducing the chance of mixing up similar-looking pins and springs.