"To the person who used .12's in this pistol: NEVER use .12's in anything by grenades. .12's break apart from force when fired and will completely and totally ruin a gun.
Just use .20's. Much safer, much better, tighter groupings and accuracy.
Far as gas efficiency to the other guy? It will get the entire magazine off, this much I know. Held one inside a local shop. Very, very comfortable gun to hold; has a good heft to it. And it definitely gets all the shots off. As to how many extra on a single magazine gas fill on propane (green gas is propane with additives...same thing) I'm not sure.
With the kind of power this gun can deliver, if you're looking for a nice pistol, this baby's nice.
Anywho, this is a nice pistol. I would recommend it, but there are also lots of other options worth considering too. This is definitely a great pistol for anyone involved in WWII scenarios, as this was a primary german sidearm, as well as the PPK. (No, lugers were not often issued. It's a myth.)"