Hello, thanks for taking time with me today. Attached are a couple pictures of 2 guns that I would like to identify. They are both marked with a crown proof mark with a house on top and a u below, also they are stamped with 2grN.G.P. M/14 on one and 2gr N.G.P. M/71 on the other. Both look to be about 50 caliber and I do not believe that these are hand guns, I believe that they mount on something and were/are fired remotely through linkage or a cable or rope or string. One has a 12 round capacity and the other 24. Both are made from cast iron and the cylinders advance with the pull of the trigger like a revolver.