AR-15 80% Lower Receiver 10 Pack. Each OX Armory lower is Precision machined from the highest grade Aircraft Aluminum Block. Our signature series includes an oversized trigger guard. The flared mag well proudly displays the OX icon that distinguishes our product from all others. Finally, our lower is presented in a durable flat black finish (standard) but is also available as a tumbled raw aluminum billet. 80 Lower 10 pack in stock.