PF upper and BravoCompany KMR compatibility?

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I believe you're talking about the steel alignment clip that locks the KMR from rotating when it's installed? It slots into the KMR rail, and bridges the upper receiver under the picatinny rail. It's specced to fit a forged upper, so it'd depend on the width of the PF upper at that point.

If the billet PF upper is the same width as a forged upper at that location, then you should be good to go.


ETA: Sorry for the blurry grainy pic (I'm at work), but it's blown up from a mockup pic I had.

You can see the metal clip at the top rear of the rail. It is slotted into the KMR rail from the rear, and has tabs that protrude rearward from the rail and straddle both sides of the upper.