Bought new Sub2K 40 SW cal Glock mag compatible on the 17th. Resisted shooting until cleaned/lubed/familiarized myself with weapon. Pulled bolt and cleaned today. When tried to reinstall bolt I met solid resistance and a metallic clank. Examined bolt face through front of receiver and noted interference with hammer. Thought I had neglected to cock bolt before disassembly and remembered considerable resistance to bolt removal. Pulled trigger and hammer dropped briskly. Recocked with plastic brush handle and noted hammer still interferes with reassembly. Held hammer down past cocked position with brush handle and installed bolt. Action seems to work okay but I'm sure that hammer is dragging on bottom of bolt. Any suggestions?