I like the voodoo's worked good on one of mine.
Put a big freak insert on for testing buddy ++692.
Fire shots slowly like one a second and see if you still pop. Don't walk the trigger.
Try this test buddy...............
"The Evil logo button on the back end fell off during the first game. CONSISTENTLY BREAKS BALLS. I'm not talking barrel breaks here but breaks on the bolt and up the feed tube. The blowback pressure is terrible. Some forums say it's because of air leaking past the detent grooves. With no hopper on and two balls in the feed tube, when you shoot the one ball the second ball flies 4 feet up into the air. With the stock bolt, the second ball doesn't even move."