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Old February 26th, 2012, 20:20   #2
Join Date: Jan 2009
Location: Northern Ontario
It sounds like your outer barrel is not tight, causing the whole outer barrel to twist with the hop up unit, because your hopup slides into groves on your outer barrel. I suggest just to take off the RIS and tighten down the outer barrel, making sure you can center the groves of your hopup unit.
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