Are you thinking about build a new AR-15 rifle or completing that lower you have had sitting around for months? Well then look no further that this receiver extension for your AR-15 lower. CMMG has created the perfect buffer tube. This mil-spec buffer tube is Mil-spec compatible and will work with all standard pattern AR-15 lower receivers.
Specifications and Features:
CMMG AR-15 Receiver Extension MK4 55CA9D7
Mil-Spec Buffer Tube
Hard Coat Anodized Finish