*** Originally posted by mark ***
Roland, Headless Thompson
Hmm, what a different tag...Anyway, Welcome to the forums!
As for the "firing pin" the proper modelgun term is the "Detonator" forum member Francky1958 is the person to ask about parts for the Hudson M1A1..I do believe that the MGC cartridges can be used but it will take a custom detonator to work properly.