The Magpul Battery Assist Device (B.A.D.) is an extended bolt release that allows the shooter to keep his hand in the ready position on the pistol grip and operate the bolt catch with the trigger finger. Streamlines bolt catch manipulation to get the weapon into battery more quickly for improved operator readiness and weapon handling efficiency. Easy to install and remove?no weapon disassembly required. The B.A.D. lever clamps securely to the factory bolt release with a Torx� head screw and extends a paddle through the front of the triggerguard to the right-hand side of the weapon. Trigger finger can stay outside the triggerguard as you operate the lever, and factory bolt catch retains normal function with B.A.D. installed. Made of a high-grade aluminum alloy, hardcoat anodized to MIL-A-8625F, Type III, Class 2 spec for extra strength and wear resistance.