The peg holes in the v6 gearbox are round. Even a bone stock marui v2 spring guide won't easily fit, but it will with a bit of fidgeting and mashing in there.
Guarder v2 spring guides most DEFINITELY will not fit as they're shaped like the Marui spring guide's pegs (square) unless you modify the gearbox or spring guide.
Unless Guarder has very recently changed their design and I'm not aware of it...
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