Stager, you stated in the original post/notice that the chamber expanded? In this instance the bolt lock, as you call it, did not fail at all, correct? If it did, the user would possibly be wearing the carrier assembly as a face ornament or worse.
Which is it?
This whole thing stinks and to me at the moment, actually sounds like a setup, which I think you lot at stager have unfortunately, only seen the end result.
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