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Old January 9th, 2013, 06:58   #2
MaybeStopCalling
Green Synergy
 
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Join Date: May 2009
The hopup rubber used in the WE M4 is the same as the VSR type rubber. So that's one reason. Also the heavier ammunition found in GBBRs should also contribute... I run my C8 with .28 rounds, Modify rubber, for your reference.
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