Windham Carbine Buffer Tube (Commercial) Also called the Receiver Extension, this quality part is machined to commercial specs from an aircraft aluminum extrusion to accept the6-position adjustable telestock. Precision notches on the
Mil-Spec Six Position Rifle Receiver Extension Tube
Milspec Receiver Extension (Buffer Tube)
AT3™ Mil Spec Buffer Tube AR-15 | AR 15 Parts | AT3 Tactical