Battle Arms Development, Inc. (B.A.D. Inc.) is a design, research, and development firm incorporated in 2009 with a focus on small arms design including firearm components, tools, gauges, accessories, and complete weapon systems. Their Workhorse lower receivers are made from 7075-T6 Aluminum Alloy and packed with features to build a true workhorse firearm.Features :Quality Aerospace 7075-T6 Aluminum AlloyType III, Hard Anodized Flat Black FinisCompatible with TDP/Mil-Standard AR Lower Receiver PartsBroached Magazine WellMulti-Caliber Marking for Build VersatilityEasy Install Set Screw Bolt Catch PinUpper/Lower Receiver Tension Screw