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I haven't read through the whole thread, just the first 6 or so posts, but this is what I found out a couple of days ago when I fitted one of the Dboys hopup....
With just the mechbox and hopup, see if the rear of the hopup fits into the opening of the mechbox where the nozzle comes out. On my build, the hopup body was about 0.5-1mm too large in diameter. I had to file it down, evenly around the whole circumference, until it fit. Do it evenly or your hopup will be off line a bit.
Not having the hopup fit into the mechbox prevented the upper from sliding back far enough to allow the front pin to get in...
Good luck!
Tys
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