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bolt will not stay open

  1. CAMP CARBINES 9 & 45
    Hello out there. I have a Marlin camp 9 that I have yet to fire. To get it ready, I replaced the buffer and put in the recommended 16.5 lb spring and reassembled it. The problem I am having is the bolt will not stay open with the empty magazine in the well. I have disassembled it and...