AR15 mil-spec Lower Receiver Parts Kit

This AR15 mil-spec Lower Receiver Parts Kit contains all the small, essential components needed to complete your stripped or 80% lower receiver. Whether you’re assembling a new rifle or replacing worn parts, this kit provides the reliable, standardized hardware required for a functional fire control group and controls. Sourced for durability and correct fit, it’s the foundational step in any serious AR-15 build, shipped fast and direct from Miami Shooters Supply.

Key Features

• Includes all necessary springs, detents, pins, and trigger guard for a complete lower assembly.
• Manufactured to U.S. military specifications (mil-spec) for consistent dimensions and reliable performance.
• Features a standard mil-spec trigger and hammer for a familiar, crisp pull.
• Components are phosphate coated or properly hardened for corrosion resistance and longevity.
• Packed with an easy-to-install, standard A2-style pistol grip.
• All parts are individually bagged and clearly labeled to simplify the assembly process.

Built For

This kit is ideal for the home builder completing their first or fifth AR-15 project, providing all the small parts that are easy to lose or source incorrectly. It’s also a practical solution for armorers and shooters needing to replace individual components or refresh an entire lower receiver with proven, standardized parts.

Specifications

• Compatibility: Fits mil-spec AR-15 platform lower receivers.
• Caliber Compatibility: Multi-caliber; works with 5.56/.223, .300 Blackout, and other standard AR-15 calibers.
• Trigger: Included mil-spec single-stage trigger group.
• Grip: Standard A2-style polymer pistol grip.
• Finish: Phosphate coating on steel components for durability.

FAQ

Does this parts kit include a buffer tube assembly or stock?
No. This is a lower receiver parts kit containing the internal fire control components, pins, springs, detents, trigger guard, and pistol grip. The buffer tube, buffer, spring, and stock are sold separately.

Is this kit compatible with any AR-15 lower?
It is designed for standard mil-spec AR-15 lower receivers. It may not fit commercial-spec or some proprietary lowers. Always confirm your lower receiver’s specifications before purchase.