So i put the Nine Ball piston head in... started shooting through the chronograph and when shooting single shots it was working great. (I am getting a +30fps boost as well)
BUT..
Started double/triple tapping into a target and the slide seemed to start sticking..hammer remained back a little. I was not able to shoot again until i pulled the slide back to charge the gun. Once i did that i was able to slowly shoot one shot at a time but as soon as i start increasing the shot frequency it just locked up again.
The nine ball dyna piston head comes with 2 o-rings (one larger then the other) I tried both o-rings and getting the same result. It almost seems like with the improved air seal and compression.. the recoil spring is no longer strong enough to support the full metal slide (despite it being a reinforced spring to begin with).. not sure here.
I also did a hop up rubber floss/teflon mod but that wouldn't be the cause would it? I'll remove all of that to eliminate it from the list of potential issues (but i've done it before with the same pistol and it didn't cause any issues)
Stock this gun can shoot rather quickly so if i cant figure this out i just blew $25 on a great piston head that just isn't working with my gun.
NOTE: the specific gun model is the Cybergun Licensed WWII trades KJW 1911A1 GBBP (Co2 & Green Gas)