Much thanks for all the advice. cjb brings up a really good point about concentricity of barrel extension, upper receiver, and bolt even though everything may be tightened down and to proper numbers and AKDoug correctly points out it is one of the last common parts... E-Man reminds me of the reputation the manufacturer of the current upper has...
In the name of good troubleshooting, I'll definitely get it out without the muzzle device to see what happens. Meanwhile, if it does happen to come down to replacing the upper, would
this upper from BCM be a decent choice? While BCM is a trusted vendor, the name of the manufacturer of this upper is not mentioned for reputation checks. No offense to BCM here; please understand.
Thanks again.
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