J-5 Tactical Supply carries some of the highest quality Big Bore AR-15 parts in the industry. Whether you’re looking for .458 SOCOM uppers, .450 Bushmaster uppers or any other big bore parts we can get if for you. Our inventory is constantly growing along with our relationships with new manufactures. This means we can get what you want. All our our parts are American made. Contact us today and let us know what you need for your next built.