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1. Does it cycle (not necessarily shoot a bb, but rather fire and reset) normally for semi/full auto?
2. If you insert a mag with bb's and rack it and fire (in semi)...does the BB shoot? Does it load another BB (guessing not always from what you originally posted)? Check by dropping the mag, rack the bolt and look into the chamber.
3. When you say jamming, do you mean that more than one BB is getting shot out? there are a bunch of BBs jammed into the chamber? Or rather...a BB isn't being loaded into the chamber with every cycle.
4. Are the feed lips of the mag ok? If you use something to flick the BB's out of the mag one by one...does the next BB pop up into position cleanly/properly?
5. Does the stock nozzle/setup work fine? Helps narrow things down.
6. Did you install/change any other parts?
Tests
1. Openup the NPAS to max velocity. Does it cycle/feed/shoot properly? At just under 350fps (depends on temperature) the system is almost choked off...it may be short cycling when the bolt isn't coming back enough to pick up the next BB.
2. Try the stock nozzle body...but keep the RAtech NPAS floating valve and spring. If you have calipers measure the outside diameter of the nozzle tips. I've noticed a batch of RATech nozzles have come out where they're a bit bigger (in diameter) than the stock nozzles. The little difference causes the nozzle tip to wedge into the chamber tightly. This can hang up the firing cycle and cause misfeeds. So far as I can tell....aside from those dimensions there's little difference between the stock nozzle and RATech nozzle (I've been using the stock nozzle body for ages and it's held up well).
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