The Stock Tube Adaptor has been engineered to be a strong and compact method for shooters to install a stock or pistol arm brace on any firearm with a picatinny rail piece. The Midwest Industries Stock Tube Adaptor was tested for the most extreme usage. This product is machined out of billet 6061 aluminum which is hard coat anodized for a lifetime of service. The Stock Tube features a easily accessible water proof storage compartment for additional storage. With the compact design, the 6 position Mil-Spec diameter tube allows for the adjustment for any shooter. This product is 100 percent made in the U.S.A. and is backed by a lifetime warranty by the manufacturer.