Need to know what model. Early ones it could be a bent cross screw that the bolt slips on to. These early models had no round nut on the right side, would work loose, and bend. If it has a cocking indicator IN the bolt, I have seen that jam things up. The early bolts had a different firing pin cocking set up and could cause problems. Might be the cam on the lever is too high (Someone may have replaced the Lever). The cartridge guide on the bolt may not be aligned with the notch in the barrel. As Norm99 said, we would have to see it.
