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 delivers all essential components to assemble a functional lower receiver, from trigger groups to selector switches. Designed for reliability with machined steel and hardened springs, this kit eliminates the guesswork of sourcing individual parts. Whether you’re building from scratch or replacing worn components, it’s a no-nonsense solution for range-ready performance.

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
• Standard MIL-SPEC dimensions for broad compatibility
• Precision-tested for smooth trigger pull and positive reset

Feature Breakdown

The heart of this kit is its fire control group, built to withstand repeated use without degradation. Unlike budget alternatives with cast components, CMMG uses CNC-machined steel for the trigger, hammer, and disconnector. This translates to consistent break points and reliable ignition, whether you’re at the range or in training scenarios.

Attention to detail extends to the smaller components. Detents are precisely sized to prevent walk-out, while selector detent springs provide positive clicks between safety positions. The included takedown and pivot pin springs maintain proper tension even after repeated disassembly – a common pain point with lower-quality kits.

Assembly is straightforward for builders with basic mechanical aptitude. All necessary pins and springs are included, with no proprietary tools required beyond standard armorer’s punches. The components arrive properly degreased and ready for installation with your preferred lubricant.

While designed as a functional upgrade over factory-installed parts in many completes lowers, this kit also serves as an affordable troubleshooting solution. If you’re experiencing light strikes, gritty triggers, or safety selector issues, replacing the entire FCG often resolves multiple problems simultaneously.

Compatibility Notes

• Fits MIL-SPEC AR-15 lower receivers (not compatible with proprietary systems)
• Works with both rifle and pistol buffer tube configurations
• Trigger compatible with aftermarket hammers/disconnectors (mix/match not recommended for beginners)
• Selector fits standard and ambidextrous safety levers

Installation Overview

Building a lower with this kit requires basic tools: roll pin punches, needle-nose pliers, and a vise block (recommended). The trigger guard installs first, followed by the magazine release and bolt catch. The fire control group comes pre-assembled for drop-in installation, though detailed manuals are available from CMMG for first-time builders. Expect 30-60 minutes for a complete assembly depending on experience level.

Frequently Asked Questions

Q: Does this include a pistol grip or buffer tube?
A: No, this is a lower internals kit only. You’ll need to source those components separately.

Q: Is the trigger single-stage or two-stage?
A: This is a standard single-stage MIL-SPEC trigger with approximately 5-7 lb pull weight.

Q: Will these parts work with my 80% lower?
A: Yes, provided your 80% lower is machined to standard AR-15 specifications.

Q: Are the springs marked for identification?
A: No, but the kit packaging includes a diagram showing proper spring orientation.

Q: Can I use this for a .308 AR build?
A: No, this kit is designed specifically for standard AR-15/.223/5.56 platforms.

Warranty & Shipping

CMMG backs this kit with a limited lifetime warranty against manufacturing defects. All orders ship within 1 business day via USPS or UPS with tracking provided. No signature required for delivery (unless specified at checkout). Due to state regulations, we cannot ship to CA, NY, or other restricted jurisdictions – check local laws before ordering.

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