I was a good boy and Santa brought me an 870 Marine Magnum...(Really I have had a couple of weeks but I had to promise not to shoot it until after Christmas...I cleaned and oil it and then let it rest until Christmas...any way I took it out for a quick shoot on the 25th after 4 rounds it locked up...I had to take the gun apart to get it freed up...when I looked at the trigger assembly...I notice something loose and moving around (it was shaped like a big hook)...So I removed the trigger assembly...and found that the hook shaped object had came unhooked so to speak...It is I believe that it is part of the cocking mech....it attaches to the action bar...I put it back in place and the gun worked fine for about 20 rounds then repeated the same thing only this time I put the safety on and racked the slide hard and it freed up...after about 5 more it repeated this again...I racked hard again and it was free...should I contact Remington or what...could this be from over lubication...Help