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From what I understand the barrel torques when fired causing the block's left side to slam the frame. It may eventually fracture and break. The early blocks were machined with relatively sharp corners and stress cracked easier than the newer generation blocks which are machined with rounded corners. I had an early Italian first generation locking block break after many rounds fired too. I just swapped it out for another one and have been chugging along ever since. The maybe some compatibility issue beteen the generation of locking blocks and the pin that goes in them.
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