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 reassembled it, following the instructions in the owner's manual six times now and I can not figure out why I am having this problem. If anyone out there has had this problem or knows how to fixed it, I would greatly appreciate hearing from you. Thank you.