CMMG AR-15/M4 Receiver Extension Stock Kit - Carbine

The CMMG® AR15 Carbine Receiver Extension and M4 Stock Kit has all the essentials for your next AR lower build. The M4 buttstock is a proven lightweight design that is extremely durable. Combine this kit with your choice of Lower Parts Kit to complete your lower group. Kit Includes: 6-position M4 Buttstock AssemblyCMMG 6-position mil-spec Receiver Extension (Buffer Tube) - Carbine LengthBuffer Tube Castle NutReceiver EndplateCarbine BufferCarbine Action Spring Compatibility: Compatible to AR-15, Mk4 and M4 Mil-Spec Lower Receiver Compatible accessories, see under this article, accessories