Battle Arms Development Bolt Carrier Group, 223 Remington/556Nato, Fits AR-15, M16 Profile, ArmorTI Coating, Black BAD-BCG-M16-TI The best just got better! From the inventors of the very first fully modular" patented" ambidextrous safety selector for the AR-15 platform" Battle Arms Development is raising the bar on reliability and compatibility of hard-use MSR components.