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G&P M4 upgrade to fps 420
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November 25th, 2009, 17:22
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kudykam
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Join Date: Aug 2009
Location: Czech Republic - Europe
Which reinforced gearbox for 8mm bearings (kanzen ceramic) would you recommend?
I am planning to change gp 7mm gearbox and modify smooth modular gears as I am unhappy with it....
kudykam
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