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As long as it's straight it won't hit the outer barrel. It should be like adding a silencer, I've not had an issue. My p90 silencer extended 4" further than the inner barrel and not once did a bb hit. Also, on an aug I had I swapped inner barrel out for a 650mm and didn't have to change anything else. It worked fine and gained 15fps. Accuracy and range seemed unchanged.
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