AR-15 Build Kits

AR-15 Build Kits & Lower Parts Kits

Find AR-15 build kits and lower parts kits (LPKs) that simplify assembly and lower troubleshooting time. Our curated kits pair legit components, barrels, BCGs, handguards, and quality LPKs, from reputable brands. Product detail pages include barrel length, rifling, material, and compatibility notes so you can match uppers and lowers with confidence. For each kit, we also surface compliance details and shipping eligibility based on supplier rules. Use the filters to sort by caliber, barrel length, and price. If serialized firearms are required in your location, we clearly label serialized alternatives and FFL-compliant purchasing options.