I'm doing a custom build on a 300 Mag Vanguard. Among other things, I'm replacing the stock with a Black Hawk Knoxx Axiom. I'd like to get rid of the floor plate system and get a hi capacity magazine/s. I have no official gun smith training but seem to fumble through the basics with ease. How do I go about achieving this ? Does somebody make an aftermarket system? Thanks for any help.