With an open trigger well, the RISE Stripped AR-15 Lower Receiver is ready for the trigger guard of your choice. It features the distinctive RISE Armament scorpion logo on the magwell and is marked "multi" to use with any caliber on the AR-15 platform. Weighs 10 oz. Multi-caliber marking Open trigger well 7075-T6 aluminum forging Accepts A 3/4 in. and 1 in. grip screws MIL-A-8625F, Type III, Class 2, hard anodized flat black finish