From my experience... in a nuteshell:
Different brands will have different specs for the same gun.
DO NOT MIX DIFFERENT BRAND PARTS.
For example: G&G Mp5 and Cmya Mp5 although they are the same gun will have a different measurement for the nozzle, gearbox, body, etc.
Another example: sometimes a gearbox's front end will be thicker at the front and that pushes the hop up forward, which results in needing a longer nozzle compared to another gun that has a thinner front.
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