I have had nothing but bad luck with BCM barrels (sample of 5 personally owned and numerous students) over the last five years. I know they have a good reputation from trusted sources but there are also a number of other trusted sources with experiences similar to mine.
The vast majority of parts on my guns are DD.
I should add that BCM was receptive to my problems and offered to replace barrels, but after playing that game a few times and still having 4moa guns or extensions that wouldn't fit receivers (even their receivers) I decided to move on.
I'm extremely surprised to not see Sons of Liberty Gunworks on this thread. They are newer but have already gotten reputation on par with BCM & DD. I have a lower from them and plan on purchasing an upper to round it out. Their Owner, Mike M. has been featured on multiple P&S Modcasts if you need any further proof.
A good buddy of mine had a BCM upper that wouldn't break 2 MOA, and 3 MOA was more normal. It was a 410SS 18" spr of some variety. He sent it back on his dime. They evaluated it and sent it back to him and said it was "to spec". I felt terrible as the one that had recommended it to him. After several hundred rounds it's starting to settle in, but I'm distraught that 3 MOA is to spec for a precision upper according to BCM.
I recently purchased a BCM barrel, upper, gas block, etc. I didn't want the BCM rail, so I assembled it myself with a geissele. The barrel was 3-4 MOA with match ammo. I gave it 600 rounds and it never improved, so I traded it. I didn't want to play that game again.
Maybe it's just our luck but the last few BCMs we've had between us just weren't impressive compared to the ones of past. Meanwhile, DDs are still rocking, albeit a little over-gassed. I'm kind of looking for a go-to barrel maker at this point. I recently built an upper with a criterion and it shoots great, but it's over-gassed as hell.
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I have two Specialized Armament-Colt 6933s that were built by Ken Elmore. They both started off as LE6933CK factory upper receiver assemblies that I sent to Ken to be built along with my supplied Colt SBR'd stripped lowers and all Colt parts as supplied by SAW. They both have all of the SAW mods. Ken's and SAW's reputation as THE leader in all things Colt AR is well established and well earned. These two rifles have been used extensively with zero failures. I trust them with my life and the lives of my loved ones without question. That's the highest compliment you can give a firearm.