The Fortis Billet 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 303 Stainless Steel. Magazine rod is 303 Stainless Steel for further added durability. IncludesMag ButtonMag CatchMag Catch RodMag Spring 17-7 SS FeaturesSame low profile as a mil-spec magazine buttonLow profile prevents from over-throwing the magazine catchFull aggressive front serrations while having full-length threaded internalsUltra lightweight