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Old August 1st, 2009, 14:50   #10
aka coachster
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Join Date: Mar 2008
Location: T dot
it goes on the inner barrel and should be on the muzzle side of the hopup unit. it's basically blocking your barrel and rubber from seating properly because it's in the way.

take an allen key or some other tool and try to push it out from the other side. ie. insert the allen key where the BB's enter the hop up.
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