Battle Arms Development Hand Stop, Compatible with M-LOK Rail Systems, Black BAD-MLOK-HS The Battle Arms Development Micro Hand Stop is a great way to keep a secure grip on your firearm without letting your hand slip too far forward. This hand stop is compact and lightweight" keeping your firearm nimble for target transition. 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.