The Forward Controls Design A5 Receiver Extension Tube is made in collaboration with Sons of Liberty Gun Works and is made from 7075-T6 aluminum and black hardcoat anodized. Additionally, it features rolled threads for easy isntallation and a dry film lube applied on the interior for smooth function. This 9 position A5 buffer tube is compatible with .308 ARs as well as the VLTOR A5 buffer systems with a rifle length spring but can still be used with carbine stocks. Extra drain holes have been added and all sharp edges have been rounded for a premium fit and finish. The Forward Controls Design A5 Buffer Tube is a premium component for your next AR build.