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The gap is the groove inside the barrel where it is supposed to meet the chamber, making ball breaks more prevelent shooting at higher bps. (i think)
I do not think I owe him an appology, he obviously knew what he was doing, because he labeled it as a spyder threaded barrel, so he could not get in any trouble for mislabeling even though it has a flaw.
Oh well, at least I have one that fits now.
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