Hey Cameron,
I got my Tri-Rail and what a beauty! This thing fits perfect without modification on a regular s-12. I have HK sights on my tromix and have been grinding to make it fit like you said I would. I have one side done and now working on the other.
I need to touch up the black that I'm filing/grinding. What should i use to get a close match?
Really, really, really nice precision product!
I have an previously installed Halo for sale if anyone is interested. I can send pics upon request. $275 shipped anywhere in the continental US.
Thanks,
Dave