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300 microns? That's .012", that's huge.
When I was messing around with air nozzle length, increasing the length by .010" would prevent it from feeding at all. Shortening by .010" would cause a 70fps loss.
A regular M4 nozzle of any brand should work fine.
What's your rate of fire? Sounds like you're in the 30rps range.
Should have a sector chip and be short stroking the sector gear by a tooth or two.
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