Thanks Muddy, that’s very interesting, I’ve never heard of that type of design before.Pete, Not sure of the dates but a guy name of Kurt Giss came up with a system for diana that had two pistons instead of the standard one piston. One piston does the air moving work forward and the "dummy" piston goes in the opposite direction canceling out the recoil. Mostly 10m guns but they have absolutely no recoil of a springer. There's more to it than that and more knowledgeable people will fill in the blanks but that's the gist of it.
Upvote 0