Re: So I had an idea...
I knew I didn't come up with an original thought! Looks like POF is a step ahead of me, I've probably seen theirs before and just don't remember.
I coated the upper, lower, A.R.M.S. mount & rail with stainless Norrell's moly resin and all of the small parts with black Norrell's.
Thanks for the comments guys, better than I thought they'd be.