Everyone who knows me knows that I am a big fan of the KJW Berettas - one of the best skirmish-worthy (if not THE best) GBB's out there. I decided to see what I could do to soup it up a bit and installed a PDI piston head. It didn't do much at all for the velocity, but it nearly HALVED the gas consumption! I can now get close to 50 shots off on one fill of green gas. Before the piston head change, I was lucky to get off 25 shots (1 mag worth). I highly recommend the PDI piston head if you have a TM Beretta or a KJW Beretta - it's only a $10 part, and it will save you that much in gas alone. Now, if I could just get a bit more hop up on the pistol...
