WMD Guns NiB-X Buffer Tube
WMD Guns machined aluminum Mil Spec receiver extension tubes accept an M4-style adjustable carbine buttstock. Six precision-machined notches on the underside provide plenty of options for setting length-of-pull. These are perfect for a custom build or installing a mil-spec stock on a civilian carbine, or updating a fixed-stock rifle with an adjustable M4 stock. They are machined from a lightweight aluminum extrusion then NiB-X coated.