I bought a Browning Model 12-20ga from a guy on the web a few months back, and found that it would dump a shell out the bottom after firing a round. Apparently recoil would allow a shell in the magazine to get below the lifter/carrier. I took it to a local smith who replaced the magazine spring, which didn't fix the problem.
So, I took it back, and he ground on something till the shells stayed inside the gun like they were supposed to. I asked him about a stronger lifter/carrier spring, and he said there wasn't enough room there for a heftier spring.
I have shot a couple of boxes of shells through it since, and it seems to be working ok now.
Don't know if this is relevant to the thread, but thought I would add my experience.
Happy trails,
HHH
I had a Browning M12 repro, a beautiful Grade V 28 gauge that gave the same problem. If my memory is correct, the carrier(another name for lifter) is returned to the down position by spring tension. It was found to be dragging on the frame. By relieving the dragging area and possibly increasing the spring tension, the problem was eliminated. I had several problems with this gun and learned a lot about fixing them myself, during that period. After selling both the M12 and the M42, I found myself missing the 42. I now have another one and am very happy with it.
