True Mil-Spec Buffer Tube by ALG Defense, made from 7075-T6 aluminum and is nearly double the strength of 6061-T6 aluminum found in most other “mil-spec” and commercial buffer tube variants. A dry film lubricant is applied to the buffer tube, which creates a semi-permanent application of solid lubricant for maximum wear resistance. Built by the Tier One supplier for military contractors of the M4 Carbine, these are the superior buffer tubes that military and law enforcement officers entrust their lives with every day.