Originally Posted by
blooregard
My witness has been struck down with the problem where it fires 6 shots, then refuses to cycle properly then dumps its gas down the barrel.
I stripped it down and found nothing, so delved a little deeper and removed the blowback piston assembley, I stripped this apart as my brain was telling me it looked a little dry (as all problematic mechanisms do when you just want them to work) and out the piston fell a BB.
The piston consists of 3 parts, the piston, the cylinder and the insert for the gas tube (and a spring for closing the piston after the shot). The BB was not evident until both it and the insert fell out of the piston when I stripped it. I'm not sure where in the piston it was but it was definately in there.
Hope this helps anyone else who has seen this problem.