Battle Arms Development Magazine Release Kit, Package 2, BAD-EMMR-B-L (Enhanced Modular Magazine Release - Large - Black), AR15-MCS (Magazine Release Spring) and BAD-EMC-IC (Enhanced Magazine Catch) BAD-MRK-PK2 Established in 2009" Battle Arms Development" Inc. (B.A.D. Inc.) stands as a distinguished force in the realm of small arms innovation. Nestled in the heart of Henderson" Nevada" their company is driven by a relentless commitment to pushing the boundaries of small arms design and manufacturing.