The Battle Arms AR9 Glock 9mm Lower Receiver is the perfect pair to the double stack, 9mm glock user. The lower is precision cnc'd from billet 7075-T6 Aerospace Aluminum and has had all of the sharp edges hand de-burred. The MRB (Magazine release block) conversion is also machined into the lower from factory. The Pictograph Selector markings are properly marked for 90Adeg Safety or BAD-ASS-ST / BAD-CASS-ST Short Throw Ambidextrous Safety Selectors. Every part of the lower is designed to work best with the 9mm glock magazine and is sure to last a lifetime! FeaturesMIL-A-8625F, Type III, Class 2, Hard Anodized Black FinishCompatible with TDP/Mil Standard AR Lower Receiver Parts Multi Caliber Marking for Build VersatilityFlared, Deep Beveled Magazine well DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.