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If it isn't obvious, I was inspired by the M110 and Mk 12 mod 1.
I just got the upper back today. I had the barrel cut, crowned, finished, and checked for sufficient gas port diameter by Lance at Dane Armory. He also matched up barrel/feed ramps and assembled the URX.
Here are the specs on the gun:
LOWER:
Colt 6920 lower receiver
Geiselle 2-stage trigger
KAC M110 stock
Ergo grip
Enidyne buffer
Wolff buffer spring
UPPER:
Vltor MUR upper
Vltor/BCM charging handle
Young MFG NM Bolt/carrier group
Krieger Match HBAR 1:7.7" cut to 18"
Surefire 556k muzzle brake
KAC URX II full-length rail
Harris bipod
SCOPE:
Schmidt & Bender 3-12x42 L3 Illuminated reticle
KAC M110 30mm scope mount