Quote Originally Posted by oling View Post
I am well aware of that but none of the BB pistol I shoot seem to cool anywhere near as quickly as the Umarex co2 replicas and I believe that's because the process is augmented by so much metal contact.
Think you are wrong there. The cooling depends on the amount of gas liberated per shot, so your BB's may be more economic. I did all the work on gingernuts pistols and looking at them think I get more velocity by modifying the valve assembly. Will have to look for an old 1911 to do the full monty on and see what the limit is. That said I have had all the umarex pistols except the Beretta and I dont like any of them. When you try to make an air pistol look like a real firearm you always end up with compromise in performance. The only one that isn't is the Schimel GP 22.

Baz