Makes a great Diesel, and is the lightest .50, even lighter than my Webra .50 I have two Fox .50s now, I bought a .50 sleeve and piston and made my .46 into a .50. Bob Davis tells the story of how the .50 happened, apparently Mr. Fox had ordered a batch of .60 cylinders and they arrived with a machining error. Fox simply cut them down a little to fit the .45 case and the .50 was born.