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Here's the real question: What is the brand of gun? From my experience, the nozzle isn't just gun specific, but is also hop up type specific in some cases.
Your saying the hop up unit is a G&P metal one reminds me of Apoc's G&P SPR that i set up for a high powered counter sniper gun. Since it had G&P everything, I replaced some or the seal parts and put in a 150fps spring, air seal nozzle, different piston, etc. Predicted I would get around 490fps out of it, but only was getting 420ish. Nutshell, the G&P nozzle in the gun was metal and had a square end on it. What I installed was tapered. I put the stock metal one back in, and the fps went up to 480ish.
Now, not that I'm saying this is the cause of the problems, but is food for thought. Double feeding to my mind indicates an issue with the hop up unit, such as split C-clip (that holds the barrel and hop up unit together), etc. Could possible spill an entire mag too if bad enough. Maybe check the hop up before dealing with the mechbox, it could be the nozzle is the problem, or the nozzle and hop up unti not working properly together (hence my above blurb on the SPR)................ hope that at least puts a few ideas in your head, Brent.
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