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So, I'm seeing lots of AR barrels out there with QPQ extensions. They tout that the two pieces (barrel and extension) are finished separately then assembled to avoid torque issues. My concern is the fact that (as we've discussed here before) the QPQ process softens the material of the extensions and can lead to premature headspace growth. But if this is so bad, why are so many companies still doing it? Have they found a new material/process that mitigates this issue? Or do they just not care? How much of a difference does it make from just a round count standpoint? Headspace growth at 1K rounds versus 2K rounds?
Experience welcomed. Opinions too, if they're educated......
 

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Not educated, just an opinion. If QPQ softens the lugs on a bolt I would think the headspace would grow quicker. I believe they just don't care. So many nitride treated bolts out there now it's getting hard to fins a good old fashion carpenter steel one.
 
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