sv6rider

Ok I got a set of empire 4pc barrels and they have 2 orings on the barrel. When i screwed the barrel in my gun it would only screw in far enough to cover the first oring, the second was outside the gun housing?? anyone have these and is this a problem or normal. I used it with no problem it shot fine but the 2nd oring being outside the gun baffeled me. Anyone know if this is normal?

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Dan---Tippmann Custom Pro