Battle Arms Development Workhorse, Semi-automatic, Stripped Lower Receiver, 223 Remington/556NATO, Anodized Finish, Black WH556-LR 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.