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I toyed around with it a bit more. Just putting the rubber nozzle on the stock one, I was able to force the bb through with my lung pressure, couldn't do it with the RA tech. So the inner diameter is just a hair smaller, squezzing the rubber enough so that BB's have enough trouble getting through.
Since doing that I used the old rod that had been cut off and put it in a drill, mounted the nozzle on that and touched up the end of the nozzle, bit by bid with a file, and smoothing it with 600 grit wet sandpaper. I did this as I noticed the nozzle needed a fair extra pull to get out of the chamber. Very nice an smooth now (left it just a bit snug still, I was worried about going too far and wrecking the airseal).
Just doing a shooting test, so far up to 64 rounds on one charge. Only one instance of a non-shot (though that may have just been the bb going through an existing hole in the box)
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