BRN-180M STRIPPED LOWER RECEIVER BLACK AMBIDEXTROUS The Brownells BRN-180MA(R) Lower Receiver is specifically designed to pair up with the BRN-180A(R) Upper Receivers to maximize the full potential of this unique line. The new BRN-180M is now fully ambidextrous and includes ambidextrous bolt release and an ambidextrous magazine release. The ambidextrous magazine lever was designed to work in conjunction with the standard Mil-spec magazine catch for proper function. The new BRN-180M includes the ambidextrous bolt release and magazine release lever hardware. While designed to be fully compatible with Mil-Spec lower receiver parts and triggers the BRN-180MA(R) Lower Receive Mfg: Brownells