The Magpul Industries MAG1143-BLK BSL AR Arm Brace enhances single-handed control for AR-15 pistols, elevating your shooting experience. Engineered for robust performance, the BSL combines classic Magpul aesthetics with exceptional functionality, offering an easy-to-use adjustment mechanism. This precision-crafted brace is compatible with Mil-Spec carbine receiver extensions, ensuring a secure fit. Fits AR-15 Milspec Carbine Receiver Extensions Designed and Intended for Use in One-Handed Firing Ambidextrous Rear QD Cup Allows for Firing with One Hand Dual M-LOK slots for Additional Mounting Options Enhance your AR-15 pistol's performance with the Magpul BSL Arm Brace, making every shot count.