The Colt AR-15 Lower Parts Kit (brand part no. SPK99501) supplies the internal components needed to finish a stripped AR-15 lower receiver, direct from Colt — the company that originated the platform. This mil-spec kit is built to Colt‘s own factory tolerances, matching the fit and function of Colt’s factory rifles rather than a generic aftermarket part. It’s built for AR-15 lowers chambered in 5.56 NATO or .223 Remington, covering the vast majority of AR-15 builds on the market. Among AR lower parts kits, this Colt kit appeals to builders who want factory-original parts rather than a generic aftermarket kit.

Key Specifications

• Manufactured by Colt, the original AR-15 manufacturer.
• Built to mil-spec tolerances for consistent fit and function.
• Compatible with 5.56 NATO and .223 Remington chambered AR-15 lowers.
• Supplies the internal components needed to complete a stripped lower receiver.

Frequently Asked Questions

What’s included in this kit? This is a complete lower parts kit supplying the internal components needed to finish a stripped AR-15 lower receiver.

Will this fit any AR-15 lower? Yes, it’s built to mil-spec tolerances, matching standard AR-15 lower receivers chambered in 5.56 NATO or .223 Remington.

Buy the Colt AR-15 Lower Parts Kit

Factory-original parts built to Colt’s own tolerances are exactly what this lower parts kit delivers. Order it from our Lubbock, Texas gun shop and we will get it to you as soon as it’s ready to ship.