CMMG AR-15 Lower Parts Kit – The Complete Build Foundation

You’re building an AR-15. You’ve got the stripped lower. Now you need the guts. This CMMG Lower Parts Kit is exactly that: every single internal piece required to turn that bare receiver into a functional fire control group and controls assembly. We stock this kit because it’s the go-to for a reliable build without the guesswork.

The kit includes your hammer, trigger, disconnector, springs, detents, selector switch, bolt catch, magazine release, and pivot/take-down pins. Everything is here except the receiver and stock kit, just as it should be. The components are mil-spec, which means proven reliability and compatibility with the vast majority of AR-15 platforms chambered in 5.56 NATO / .223 Remington or .300 Blackout. Whether you’re assembling a rifle or a pistol build, this kit forms the core.

CMMG isn’t a bargain-bin brand. These parts are manufactured from quality steel and polymer, with consistent finishes and proper heat treatment where it counts. The trigger is a standard mil-spec single-stage—clean, predictable, and exactly what you need for a duty-ready or general-purpose build. It’s the solid foundation you can either run as-is or upgrade piece-by-piece later.

Forget hunting through individual parts bins and worrying about missing a tiny spring. This kit bundles all those critical small parts into one package. It saves you time, frustration, and ensures you have components engineered to work together seamlessly. It’s the smart way to start any build or to fully refurbish an existing lower receiver that’s seen heavy use.

If you demand a lower parts kit that just works, from a manufacturer trusted by shooters and builders for decades, this is your kit. No flash, just function.

Product Specifications & Details

• Brand: CMMG
• Compatible Calibers: .223 Remington, 5.56x45mm NATO, .300 Blackout
• Finish / Color: Components are Black or Unfinished Steel
• Firearm Type: For AR-15 Rifles and Pistols
• Primary Materials: Steel and Polymer
• Fits Models: Standard AR-15 Platform Lower Receivers
• Contents: Complete internal lower parts. Does NOT include stripped receiver or stock/buffer assembly.

Price: $71.45

SKU: [Your SKU Here] | In Stock & Ready to Ship