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BearJew · February 7th, 2011, 19:08

ok ummm well i have a gear box that shoots 400-500 and i want to drop it into my m4 but i need to figure out what weight i need to make shoot around 350

February 7th, 2011, 19:08	#4
BearJew Trader rating Join Date: Jan 2011 Location: Uxbridge	ok ummm well i have a gear box that shoots 400-500 and i want to drop it into my m4 but i need to figure out what weight i need to make shoot around 350