Aero’s Enhanced Carbine Buffer Tube features like carrier support extensions position guide drain holes and ramping the design of the tube. These features add reliability security and simplicity that traditional mil-spec buffer tube options historically overlook. Machined from a 7075-T6 Aluminum Impact Extrusion to mil-spec dimensions. All standard carbine stock options made to work with mil-spec buffer tube dimensions are compatible with our Enhanced Carbine Buffer Tube. Made in the USA.