Quote Originally Posted by Big Mat View Post
I had another try with it on the weekend, C02 cartridge went in fine with no hiss, but upon firing, the power fluctuates hugely between shots, one full power, then a couple barley getting pellet out of the barrel, then half power etc, in a random order. i've no idea what it means, C02 is a new area for me.
Have a look to see if there is a flat piece of metal that moves up between the hammer face and valve pin when the trigger is pulled. This transfer bar gets hammered out of shape and causes problems. On the old pistols I removed them. Not sure if they are in newer pistols. I made up the difference in hammer reach by inserting a hard screw in the hammer face.

Baz