If you are looking to replace parts or upgrade your AR-15 rifle with some new parts then you have come to the right place. This particular Buttstock Receiver Extension Tube is made by DPMS. It is designed to work in conjunction with individuals who wish to use a Commercial Diameter Collapsible stock assembly or a similar stock that utilizes a carbine style receiver extension tube.

Specifications and Features:
DPMS Carbine Buttstock Receiver Extension Tube F1000368
Thread Size 1 3/16-16 UN 3B Special
6 Position AP4 Carbine Buffer Tube
Commercial Specification
1.17" Diameter
Tube only (Buffer and Spring are sold separately)
Matte Black

Fits:
AR-15 and similar pattern lower receivers.