CMMG AR15 Lower Parts Kit

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CMMG AR-15 Lower Parts Kit: Complete Build Solution

Every AR-15 build starts with a solid foundation. The CMMG Lower Parts Kit provides all essential components to assemble a functional lower receiver, from trigger group to selector levers. Designed for reliability with machined steel and hardened springs, this kit eliminates the guesswork of sourcing individual parts. Whether you’re building a new rifle or replacing worn components, it delivers consistent performance at the range.

Key Specifications

• Includes trigger, hammer, disconnector, springs, pins, and safety selector
• Machined steel fire control group (FCG) components
• Hardened detents and springs for extended service life
• Compatible with mil-spec AR-15/M4 lower receivers
• No proprietary tools required for installation

Feature Breakdown

The heart of this kit is its mil-spec trigger group, designed to provide a consistent pull weight without grit or stacking. All pins are properly hardened to resist deformation during repeated use, while the included springs meet OEM specifications for tension and longevity. Unlike budget kits with MIM components, critical parts like the hammer and disconnector are machined from solid steel.

Selector detents feature precise chamfering to prevent binding during safety manipulation, a common issue with undersized aftermarket parts. The kit includes both standard and extended magazine release buttons, accommodating different grip preferences. Each component arrives pre-finished to prevent corrosion, though builders may choose additional coatings for custom builds.

For builders prioritizing function over flash, this kit omits unnecessary decorative elements that add cost without improving performance. The included pivot and takedown pin detents use coil springs instead of flat springs, reducing the risk of launch during assembly. All small parts are individually bagged and labeled to simplify inventory before installation.

CMMG’s quality control ensures proper dimensional tolerances across all components, critical for reliable sear engagement and safety function. The kit contains no plastic or polymer parts in load-bearing areas, maintaining durability under sustained fire. While designed for standard builds, all parts are compatible with aftermarket triggers and ambidextrous controls.

Compatibility Notes

Fits all mil-spec AR-15 lower receivers, including forged, billet, and polymer designs. Not compatible with proprietary lowers requiring unique parts configurations (e.g., some pistol-caliber or ambidextrous models). The fire control group works with both semi-auto and full-auto rated lower receivers, though final configuration depends on local regulations.

Installation Overview

Basic armorers tools (punch set, vise block) are recommended but not required. The entire lower can typically be assembled in 30-60 minutes by following standard AR-15 build guides. Pay particular attention to trigger spring orientation and detent installation to avoid function issues. No gunsmithing services or modifications are needed for drop-in compatibility.

FAQ

• Does this include a pistol grip or buffer tube? No, this kit contains only internal lower receiver components.
• Is the trigger single or two-stage? Standard mil-spec single stage with approximately 5-7 lb pull weight.
• Can I use this for a .308/LR308 build? No, AR-10 platforms require different dimensioned parts.
• Are roll pins included? Yes, all necessary pins for lower assembly are provided.
• Does this work with drop-in cassette triggers? Yes, though you’ll only need the remaining non-FCG components from this kit.

Warranty & Shipping

CMMG backs all components against manufacturing defects. Continental US orders ship within 2 business days via tracked carriers. No signature required unless specified at checkout. Must be 18+ to purchase; verify local laws before ordering.

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