Mil-spec diameter receiver extension tube uses an innovative attachment system that eliminates the need for a castle nut. Automatically indexes the tube during installation to keep it perfectly aligned, and resists working loose over time. Provides six locking positions for the stock’s lock pin, while white position numbers on the top are visible through the lock pin access hole in most stocks. Two sockets for quick-detach, pushbutton sling swivels are machined into the front of the tube. A lip at the bottom front of the tube extends into the receiver to support the carrier and prevent the “carrier tilt” that occurs on some guns fitted with gas piston conversion systems. Machined from a single piece of 7075 aluminum billet, the tube has exterior grooves running its entire length to prevent dirt or debris from impairing buttstock movement. A drain hole in the underside allows water to clear if the rifle gets submerged.

Extruded Buffer Tube- Lower-cost version of the standard Enhanced Tube is made from a 6061 aluminum extrusion and offers the same functional benefits of the machined tube. Excellent for applications where a standard-strength tube is adequate and the machined 7075 tube’s extra strength would be surplus to requirements