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look at the seal inside the chamber the loads the bb and gas
make sure that chamber moves freely, if it does not fix the problem
check the slide under the selectro switch for cracks ... bend the slide outward a bit at this point to see the crack
make sure the springs which push the chamber are not kinked
put a drop of silicon oil on top of the mag seal where it mates with the chamber .. if it's too dry it might be too much friction to allow the slide to move back witht he chamber (loading next round)
these are all problems with my glock and once looked at fully fixed the problem ... well I still ahve to get a new slide but still.
i think the best thing to do is to narrow down which functions of the gun work, if you can manual chamber a round and fire it normally the fireing mechanisim works. if the slide doesn't move back far enough it's a seal, presure, friction issue. if the slide moves all the way back but doesn't move forward it could be the slide is cracked, recoil spring, etc.
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