SHV wrote:Also if I can find this kind of stuff, will it be safe to shoot?
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Not unless the 3 prong forked firing pin has already been modified to use standard shells without the annular groove. The restriction from 12g to 14g in the bore seems to not matter overly, as several of these MkIII guns have been converted to either 2" or 2 1/2" 12g and used without problem. If you have a modified firing pin 12/14g shells are easily made from brass 12g by necking down with a forming die available from the likes CH4D etc.