It is really annoying!!!! every few shots, I have to tighten up the mag tube, dosent matter how tight I make it initially. -should I get a non extension cap??? will that loosen??? -does the mossberg 500 do this??? if no...then ill get on. this is seriously lame!!!!! Love the gun, just cant stand having to constantly keep aneye on this, as the mag loosens, the barrel loosens and the gun gets will rattle until I stop to try to fix it. this is a real problem in the shotty comps. thanks!