If it is a new Marlin under warranty, send it back to them. Call them and they will send you a UPS slip for you to send it. I bought a .444 Marlin back in late 2008 and only shot it a few times, but except for one outing, they always ended with the dreaded Marlin jam. They sent it back to me within two weeks. I haven't shot it yet, but from what I have heard, they do good work when it goes to the factory. My dealer tried to fix it 3 times before I sent it back to Marlin. They will want maintenance information and how long it has been jamming. They sent it back to me with no charge at all. I should be able to get back shooting it soon to see how they really did.