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Message: <blockquote data-quote="uncle money bags" data-source="post: 2165843" data-attributes="member: 8377">It may be an oddity, but its a wrong oddity. There is no reason that should be shorting with the description of the system you gave. I assume there isnt any unusual dragging or binding when you charge it?If not then its a gas issue. Did the upper come with the 13" vtac from BCM? How did you check the port size under the gas block? Is it possible the gas block was mounted wrong after the port size was checked?I ask because on the bcm middy I had; when the gas port on the barrel and gas block were lined up, the gas block itself was behind the ledge of the barrel stop about 1.5 mm. It didnt look right to me but when the gas block was all the way forward to the stop it cut off some of the barrels port.</blockquote>