I through my Tac 8 barrel onto the Tac 9 and proceeded to shoot 5 mags with no breaks. Not sure what the problem with the barrel could be, but that seems to be it.
Wait, if your T8 barrel worked in your T9, then the barrel is NOT the problem. At this point its best to cantact a Tiberius Tech. E-mail this guy and describe your problem; email@example.com. He helped me with a problem in my T9, and seems to have unlimited patience.
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