The CMMG Mil-Spec AR-15 Lower Parts Kit (brand part no. 55CA6C5) supplies everything a builder needs to get an AR-15 lower moving, finished in black to match standard AR hardware. CMMG built this kit to mil-spec dimensions for correct fit with compatible receivers and buttstock kits, and it’s designed to pair directly with a separate buttstock kit to complete the lower assembly. It’s a dependable, no-surprises option from a brand with a long track record in AR-pattern components.

Key Specifications

• Built to mil-spec dimensions for standard AR-15 lower receivers.
• Finished in black to match standard AR hardware.
• Package length of approximately 10.95 inches.
• Shipping weight of approximately 0.6 pounds.
• Sold as one complete unit per box (1 per box).
• Manufactured by CMMG, a long-established name in AR-pattern components.
• Compatible with the AR-15 platform lower receiver.
• Rounds out a standard AR-15 lower build alongside a separately sourced trigger and grip.

Frequently Asked Questions

Does this include a buttstock? No — CMMG designs this kit to pair with a separate buttstock kit to complete the lower.

Is this mil-spec? Yes, it’s built to mil-spec dimensions for standard AR-15 lowers.

Buy the CMMG Mil-Spec AR-15 Lower Parts Kit

Get your next AR-15 build started with genuine CMMG parts. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see our full AR lower parts kit selection.