Have you looked at the bolt around the firing pin hole under magnification?
Any obstructions? 
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"The difference is that back then, we had the intestinal fortitude to do what we needed to in order to preserve our territorial sovereignty and to protect the citizens of this great country, and today, we do not." TR
"I attribute the little I know to my not having been ashamed to ask for information, and to my rule of conversing with all descriptions of men on those topics that form their own peculiar professions and pursuits." John Locke
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