Hey Rob. I've got nothing against Vltor, but their rails seem to be designed to "jump" the delta ring.....which I won't have on this rifle. They make some nice stuff though.
AK, welcome to the forum by the way, the MI rails seem to be too tight (I.D. wise) for the Noveske brake that I want to use on this build. Though I do see that they have the Gen 1 SS series one piece rail that has enough internal real estate.
And Tom. You can't mess up the plan brother. After all, it's a "fluid and dynamic" plan. Everything's subject to change. I knew that it was gonna be tough to squeeze the "pig" into a rail. I just gotta find the right rail. That's why I'm waiting to get the barrel and brake in hand first. Then I'm gonna take measurements of them assembled and move on from there. And I did look at the KX5. A little slimmer profile on that one than the KX3. But I'm wanting the wider gaping "mouth" of the KX3. Like I said.....for the look that I'm going for. Similar to the build of yours that you showed in the pics above. As far as YHM rails....I like their stuff. That's what I used on the 300 BLK shorty that I built last summer/fall. I like their "smooth" line of rails. But I was just trying not to duplicate the overall appearance of another rifle. After all........they've all got their own attitude.
I'll find something soon enough. Keep throwing suggestions out guys. I don't have the full build etched in stone.