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Originally Posted by zReaperAssassin
I can change it out for a Retro Arms, what I have around, but air compression is great. Found the aluminum G&P nozzle to be great in my experience. But, doesn’t tell me why it gave me a 60FPS loss in the transfer of gearboxes lol
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Also VFC Rotary Hop Up with Prommy 275mm R-Hop’d Barrel
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It's not the gearbox it's the nozzle length. You swapped out the gearbox but the length from the nozzle to the hop up unit might be different since you had a g&p hop up and switched to a vfc. Lots of these parts aren't a simple drop in when you're switching brands. This is something I learned a long time ago. Either use the same length nozzle or stick to the stock parts. +/-1 mm can cause a fluctuation in fps because the nozzle doesn't extend deep enough into the hopup rubber.
You didn't mention if you swapped the gearbox she'll either so I just pray that you're using the stock vfc she'll in the vfc gun because if the gearbox is +/- a few mm in position away or closer to the hop up unit that can also mean problems.
For clarity sake and my own sanity can you just confirm if the retro arms nozzle and the stock g&p nozzles are the same length? Can you post dimensions of all 3 nozzles with caliper measurements if possible?