So I put together the build for blckout. This was not my first AR build by any stretch and not my first PCC. I noted when assembling it that the barrel extension felt kind of undersized. I haven't mic'ed the barrel or the receiver to know for sure, but when I was building it I noted that. I also torqued the barrel nut to about 40ft/lbs which is pretty normal for a non-indexing barrel nut. I won't 100% rule out that I made some mistake, but I feel pretty confident in saying that I probably didn't f'up that part of it.
I have read the correspondence sent by shooters connection, as well as what has gone between MBX. And for 3 different shooters, to buy the SAME barrel from the SAME vendor at roughly the SAME period of time and to have the SAME issue, I find it a little unlikely that those 3 shooters made the SAME massive mistake in assembly. It looks walks and quacks like it's an issue with the barrel. Here is my issue with what MBX has offered to do, and it's really a simple fix had they been up front with it to begin with. They took the barrels back for 2 shooters and tested them, great. But when they got results that differed from what the shooters got, they have thus far that I have seen NOT offered what their setup is, just essentially accused their customers of being dumbasses. If they contend that this was some assembly issue by the purchasers, then please share with us what exactly your setup is, what your torque values are and other pertinent details so we can eliminate some variables. There is a big difference between creating a scenario where your barrel shoots under controlled conditions, and what it does in the real world on somebody's gun.
For shiggles though, let's say all 3 folks just assembled them wrong or can't shoot. If your barrel is that great, what is the harm in saying "we're sorry you're having an issue, why don't we just swap this out for you and we'll see what's wrong with it". Or better yet, ask some questions of your customer about their setup and try and troubleshoot the issue. The first reaction was "nothing wrong with the barrel, they test fine". You could have tested the barrel, decided it was fine and sold it again and nobody would have known different, and you wouldn't have egg on your face from essentially telling your customers they are idiots and they are wrong. What sets companies apart is not how they handle the easy transactions, it's how they handle the adversity. Anybody can look good as long as they ship on time and generally provide what you pay for. It's when things don't go right that you really see a company's true colors.