80% AR 15 Kits

Shop 80% AR-15 lower kits and related AR components, including Polymer80 RL556v3 lower options and included tooling where noted on the product page. Review each product page for exact contents, fitment, restrictions, and product-specific details before ordering.

Compliance Notice: Product availability and shipping eligibility may vary by location. Customers are responsible for following all applicable federal, state, and local laws.

80% AR-15 Kits & Components

This collection features 80% AR-15 kits and essential lower receiver components for rifle builders. Our selection includes the Polymer80 RL556v3 80% lower, a durable and reinforced platform designed for easy finishing. These kits often include the necessary end mill and drill bits required for the machining process, ensuring you have the right tools for a precise fit.

Building with an 80% AR lower allows for a customized approach to your firearm project. Each kit is selected for its reliable fitment and high-strength construction, making it an ideal starting point for a personalized AR-15 build. Be sure to review individual product details for material specifications, included tooling, and platform compatibility before starting your project.

Complete your build: Browse our AR Parts & Accessories for muzzle brakes, safety kits, and hardware, or visit our Jigs and Tooling section for additional build supplies.