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hands down, ProWin 8mm split gear box if you can find one.
have mine now for close to 7 years, damn thing is bomb proof.
nothing beats being able to work on the gears and not have to worry about the spring and vise-versa. quick spring swap is just awesome. i would say this gearbox is what ICS should have been.
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Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.
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