I find that in semi the nozzle ends up at all kinds of various places, halfway, full back, almost full forward (2mm from breech). Really, there's nothing you can do about that, they all do that in semi. Only way I can get the nozzle to sit full forward is to fire in full auto until it rests full forward.
I stil say the hop up wasn't installed preperly, that's largely what causes double feeding, the nub is too far forward, enough that a second BB can get in the nozzle's path.
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