Mark Serbu provides a preliminary analysis of the RN-50 incident, debunking the 85,000 PSI failure rumor by calculating thread shear pressure at 161,520 PSI. He confirms production RN-50 breech caps are heat-treated, unlike an old prototype. The analysis suggests the failure was likely due to counterfeit SLAP ammunition, possibly loaded with incorrect powder, rather than a design flaw.
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