As regards 20 MOA mounts, I've used primarily the LaRue Tactical LT-111, but the Nightforce Unimount is pretty slick too. The LaRue removes without tools though and I like their outfit and products a lot. Class act all the way.
Uppers is a hard one as I used the ASA side charger in my 300 Whisper build, but have everything from Colt to LaRue, Wilson, Rock River, Les Baer and Spikes Tactical. Haven't kept up with a the latest except for the ASA. Lots of nice stuff from VLTOR, and others out there.
Sounds like you've assembled good stuff.
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