Build a custom AR 15 with an AR lower receiver from Primary Arms. Choose between a variety of stripped lower receiver products or complete lower products, and find the price that fits your budget. We have popular products like billet lowers, lightweight lowers and AR9 lowers for your next 9mm AR pistol build. Find Cerakote coated AR lowers in a variety of colors for durability and style. We offer brands you trust, like Aero Precision, Anderson Manufacturing, Bravo Company, CMMG, JP Enterprises, Rise Armament, Seekins Precision, Spike’s Tactical and many more.