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Old September 28th, 2012, 19:26   #1
Join Date: Jun 2012
Location: Laval, Quebec
Echo1 ER25K - Best Hop Up Unit???

I'm skeptical about purchasing a unit and not really knowing if it will fit. I believe, and this has to be confirmed, I must get a m4/m16 unit? If so I was looking at the prometheus, mad bull and systema m4 units. What should I do?

I have a 6.03 509mm barrel, a kwa 2g bucking + nub. Anyone have suggestions?
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