Mil-spec Lower Receiver Parts Kit & MIl-Spec Rifle Buttstock Kit

For any serious AR-15 build or repair, having the correct foundational components is non-negotiable. This Mil-spec Lower Receiver Parts Kit & Mil-spec Rifle Buttstock Kit from Miami Shooters Supply provides the essential internal hardware and rear assembly to complete your lower receiver to military specifications. It’s the go-to solution for builders who demand reliability and correct fitment, shipped fast so your project doesn’t stall.

Key Features

• Mil-spec lower parts kit includes all necessary springs, detents, pins, and fire control components for a functional lower receiver.
• Mil-spec buttstock kit includes 6-position carbine buffer tube, castle nut, end plate, buffer spring, and carbine buffer weight.
• All components are manufactured to U.S. Military Technical Data Package (TDP) specifications for guaranteed interchangeability.
• Parts are finished to prevent corrosion and ensure smooth operation right out of the package.
• Kits are bundled for convenience and value, ensuring all critical small parts are present for a complete assembly.

Built For

This kit is built for the practical builder, whether you’re assembling your first AR-15 lower or maintaining a duty-ready rifle. It’s ideal for anyone who prioritizes proven standards over proprietary designs and needs a complete hardware set that just works with any mil-spec receiver and collapsible stock.

Specifications

• Compatibility: Fits standard mil-spec AR-15 lower receivers and accepts mil-spec collapsible buttstocks.
• Buffer System: Carbine-length buffer tube with standard 6-position adjustment.
• Materials: Steel components with protective finish; springs made from music wire.
• Caliber Compatibility: Designed for multi-caliber use with standard AR-15 lower receivers.
• Included: Lower Receiver Parts Kit (LPK) and Buttstock Kit are packaged together.

FAQ

Is this a complete lower build kit?
This kit includes the lower parts kit and buttstock kit. You will still need a stripped lower receiver, a buttstock, a pistol grip, and a trigger guard to complete your assembly.

Are these parts truly mil-spec?
Yes. All components are manufactured to the official military technical data package (TDP) for dimensions, materials, and heat treat, ensuring proper fit and function in any mil-spec AR-15 platform.