« on: April 23, 2010, 07:29:18 PM »
I recently acquired a new gearbox shell for my KWA gen 1 M4 and put it together with no problems. I put the gearbox into the reciever, and again no problems. After it was fully assembled I plug in the battery, pop in a mag, and test it out. The gun sounds as if it cycles completely fine, but when firing on semi auto, some shots will not feed, then when it does feed and shoot 3 bb's come out, two of which just drop out of the barrel. Full auto acts the same, but less frequently and it tends to feed almost perfectly. I'm aware its not a magazine problem because I tested it with the KWA highcap included with the gun, a CA midcap, and a King Arms Midcap, all of which had the same problem.
I took for the the top receiver, and pulled the trigger multiple times, I can see the piston cycling fine, and the nozzle moving back and forth. Something I did notice, though, is the piston tends to stop 3/4 of the way to the end of the cylinder (closer to the cylinder head), I'm not sure if that would have any effect on it, though.
Something I feel I should note, though it may be irrelevant, is that the screw that hold the top receiver in place is stripped so I am unable to take that screw out to fully take the top receiver off, however I can open it similar to that of a real AR-15.