I don’t want to turn this into a CMMG bash but I will also warn you off them. They have had a spotty reputation for quality and CS for some time.
Couple weeks ago, a friend brought me a CMMG upper that wouldn’t extract. The railed gas block had not been installed properly. The barrel wasn’t dimpled and no thread locker had been used. Now, since he bought it used and on a DPMS lower, it may have been a parts gun but it had a CMMG barrel. I have no way of knowing if it came like that from CMMG and I’m not blaming them. But after I got it working, I installed his MBUIS rear sight and sighted it in. I was getting 2 ½ to 3 groups at 50 yards and 5" + at 100 yards. Unacceptable.
This is just the latest of several issues I’ve encountered with their stuff. Not all their stuff is bad. I have another friend who has one of their bargain basement carbines and it’s 100% reliable with good accuracy, good trigger, nice gun. Again, I don’t want this to turn into a CMMG bashing thread. To you guys that have had good luck with their stuff, Great! I’m happy for you.
An amateur trains until he gets it right, a professional trains until he can't get it wrong.