R.Marshall,
The transitional actions are intermediate length, I believe. This might give you a little to work with. You will have to modify the front end of the new firing pin any way to remove the two "lugs" that are not needed in the transitional action. It will take some careful measuring to come up with what you need. You may find the rear part of the firing pin too long, but I have modified standard length pins for use in intermediate actions. I did this by filing another groove ahead of the others at the rear and filed off the last lug that locks the cocking piece on and shortening the end to match the cocking piece. If you want to try modifying the cocking piece, get another one to work on and save the original parts. If you move the cocking piece forward, you will have to move the cut for the safety backward. This is confusing but when you examine the parts you will understand.
Mike
