I was in pretty much the EXACT same boat as you, trying to decide what I wanted, from those two companies. I decided on the CMMG, MOD4A3 upper with detachable carry handle, because I plan on adding an EOTech 512F, and I like the 1:7 twist, 4150 steel, chrome lining, T-marked upper, and the nice feed ramp cuts in the CMMG. Plus Adco is out of the chrome lined M4 profile barrels. I haven't shot the rifle yet, but I may go to the range today and sight it in. I'm very impressed with the overal quality, fit, and finish of the CMMG. Either way, you won't go wrong. For what it's worth, the CMMG barrel and front sight have more of a grayish finish than a dark black, just a bit darker than the gray color of the detachable carry handle on the CMMG Inc. site. I don't know if that would influence your decision, but I thought I would mention it in case you were wondering about the color. Also, CMMG was a pleasure to deal with, knowledgeable, friendly staff, and fast shipping.