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Old February 13th, 2012, 18:23   #6
Join Date: Jul 2010
Location: Vancouver, BC
I've recently been looking at gbbrs too and i thought this vid was pretty informative about open vs closed bolt.
WE M4 GBBR gas blowback rifle review Part 1 - YouTube

I'd go with open bolt tho. As HKGhost said, the future of GBBRs lies in the open bolt. Close bolts will eventually die off as more ppl would rather have an open bolt system.
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