Your blown BB is not uncommon; this is the area where they usually fail. In the past I've tried several welder to save a matching PO8, but few were able to successfully remove the excess weld from the inside slot in which the retaining piece turns. For shooters, I recommend the use of a Mauser relieved FP, so in the event of a puntured primer, the FP is not driven back like a piston against the rear of the BB. The easiest and probably the least expensive solution is to replace the BB. TH
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