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A 12.5" Troy A4 with no pin-weld and a standard CAR tube/SBA3 is over 26".So a 14.5 barrel might put you over the 26"? Maybe a 308 platform would allow for a shorter barrel to be used since lower receiver is longer?
My 10.3 with an A5 buffer and LAW sidefolder BARELY squeaks in at 25.925".