The Fortis Billet Aluminum Mag Catch & Button is a superior alternative to the ones found in a mil-spec lower parts kit. Easily installs in seconds and instantly upgrades your rifle. This upgrade is CNC machined from a solid piece of 6061-T6 aircraft-grade aluminum and 303 Stainless Steel. We added texture and engraved our logo for just the right touch of function and styling. The magazine rod is 303 Stainless Steel for further added durability.