Everything to Complete an AR-15 Lower — 80% Receiver Included

An AR-15 80% lower build kit bundles a stock, buffer assembly, full lower parts kit, grip, and an 80% lower receiver in one package — no FFL required. Available in multiple stock models from Magpul, Mission First Tactical, UTG, and other brands.

80% lower build kits

Filter

What's Included in an AR-15 80% Lower Build Kit

Each kit includes an 80% lower receiver (not classified as a firearm), stock, buffer tube assembly (tube, spring, buffer, castle nut, and end plate), full lower parts kit (trigger group, hammer, disconnector, magazine release, bolt catch, safety selector, pins, and springs), and a pistol grip. Because the lower ships as an 80% component, no FFL transfer is required — it ships direct to your address. Mill or drill to complete the lower, then assemble with the bundled hardware. All kits are designed for standard mil-spec AR-15 platforms.