Using the stock CA MP5 hop up and an SHS/ACE1ARMS AK nozzle. It's about 1 mm longer than the stock nozzle it came with. I left the thing with panda since i isolated the problem and now I'm still waiting to see if it's going to fix it later.
And we collectively and embarassingly spent more than we would like to admit. It was a headscratcher for the both of us because none of what we were doing made sense.
Everyone said the same thing: compression issue in the GB. But we figured that wasn't true when we tried a different hop up unit with the same/different barrels.
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