Originally Posted by JOESPUD27
I can say when it worked a really enjoyed it, not the great efficiency everybody else here has reported though. You can rip on the trigger, never once accidentally turned the safety on and missed a shot. Grips feel nice. Want to try it again in the colder 30-40s winter weather we get.
My $0.02 you millage may vary.
That sounds more like an acute manufacturing defect. Those back o-rings are what makes efficiency possible on that design. If they are Chinese o-rings, that could be the entire problem. Those guys know how to mess up an o-ring. Find a pair of fresh, firm ones and try it out. The design is sound, mainly by being mechanically simple and well balanced. You could try to burnish that hole as well.