What you've done, so far, sounds like one or both firing pins are sticking in the fired primer, suggesting a timing problem. This means the hammer(s) are not starting to cock soon enough, when starting to open. Again, stay with the logical sequence of trouble shooting. If this is the cause, the cocking lever(s) needs to be adjusted(bent) to start to cock the hammer(s) slightly sooner. Don't overdo it, because if you go too far, it may not fire afterwards. if this is all Greek to you, take it to a doublegun smith who knows what he's doing. This is a little more complicated than changing the oil in your car.
Last edited by Jim Legg; 03/08/10 06:19 PM.