BLUF: 14.x" intermediate weight barrel for a P&W builds. Something under med-con without going pencil weight by using the tapered Optimum profile.
I've very happy with my Optimum 16" and my (always)suppressed 14" medium contoured. I've thought of building a copy of the 14" with a WarComp instead of SFMB, but wonder if I might as well do a lighter profile barrel since being suppressed would be a secondary consideration. Even better if I could get a FSB on it. I don't know that I'm doing any new complete builds anytime soon, but I'll be replacing barrels eventually, and I do like the polygonal 6P rifling since it gives good accuracy and seems to boost velocity a bit.