[Flatlander]

@ Dynamo: It's the stock CA mechbox shell with some upgraded internals (see first post for list). I tried both nozzles and they both had troubles. I measured the lengths and diameters with a digital caliper and they were both withing ~.05mm of each other.

Now the funny thing is that I reassembled everything, including tightening the stock screw, and it was shooting 310 consistently on a promy 90 spring! The only thing I *think* I did differently was switch the 2 pistol grip screws in the other 2 holes. Who knows if that's what did it but I'm not touching it again until I have to upgrade it for outdoor limits...not looking forward to that! I might try to find another mechbox and throw it in there too.

EDIT: I also did try shimming the back of the mechbox. I had it such that the rear body pin was tougher to get in (took a little bit of slight hammering). Normally the rear body pin slides in with little to no resistance. The shimming had no affect and seemed to make it worse as even without the stock screw it wouldn't shoot right.