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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 reliable stripped lower receiver, from trigger group to selector controls. Designed for builders who prioritize functional simplicity over flashy upgrades, this kit includes properly heat-treated small parts that withstand repeated use. Whether you’re assembling your first lower or stocking spare components, this is a no-nonsense solution.
Key Specifications
- Includes trigger, hammer, disconnector, springs, pins, and selector components
- Mil-spec dimensions for compatibility with standard AR-15 lowers
- Heat-treated steel critical components (hammer, trigger, disconnector)
- No proprietary tools required for installation
- Packaged with individual compartments to prevent mix-ups during assembly
Feature Breakdown
The trigger group uses a standard single-stage design with consistent 5-6 lb pull weight out of the box. While not a match-grade component, the machined steel trigger and hammer interface smoothly after a short break-in period. This kit avoids the gritty feel of budget alternatives by deburring all contact surfaces during manufacturing.
Selector detents and springs are pre-sorted to eliminate guesswork during installation. The included takedown and pivot pin detents feature chamfered edges to prevent marring your lower receiver during assembly. All springs are factory-tested to ensure proper tension for safety-critical functions like hammer retention.
Unlike some kits that omit the pistol grip screw, this includes every necessary fastener. The bolt catch roll pin is properly sized to avoid the deformation common when using undersized alternatives. Each component is individually bagged and labeled to simplify inventory before starting your build.
This isn’t a “gunsmith fit” kit requiring modification – all parts drop into mil-spec lowers without filing or adjustment. The disconnector is pre-tuned to reliably reset with standard buffer weights and spring rates. While designed for semi-auto use, all components meet OEM specifications for duty-grade reliability.
Compatibility Notes
- Fits any mil-spec AR-15 lower receiver (forge marks irrelevant)
- Not compatible with ambidextrous safety selectors unless modified
- Trigger group works with both rifle and carbine buffer systems
- Includes both standard and pistol grip screws (check your grip type)
Installation Overview
Basic armorers tools (pin punches, hammer, vise block) are recommended but not strictly required. The entire kit can be installed in under 30 minutes by following any standard AR-15 lower assembly guide. Pay particular attention to the trigger guard roll pin installation – using tape to protect your lower’s finish is advised. First-time builders should note that the bolt catch spring requires careful alignment to prevent bending during pin insertion.
Frequently Asked Questions
Q: Does this include a trigger guard?
A: No – most lowers ship with trigger guards pre-installed. If yours doesn’t, purchase separately.
Q: Will these parts work with a binary trigger system?
A: No, binary triggers require specialized components not included here.
Q: Are the hammer and trigger pins retained?
A: Standard unretained pins are included. Aftermarket anti-walk pins can be added separately.
Q: Is the fire control group coated or plated?
A: Components have a phosphate finish for corrosion resistance – not nickel or chrome.
Q: Why choose this over individual parts?
A: Kit ensures all components are dimensionally matched from the same production batch.
Warranty & Shipping
CMMG backs all components against manufacturing defects for one year. No proof of purchase required – simply contact us for replacement of any failed part. Ships via USPS or UPS with tracking provided within 24 hours. No signature required for delivery unless specified at checkout.
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