Barrel threads are out of spec - Fusion Firearms UMG Barrels, Gov

I ordered this barrel (.45 acp, para ramp with .578 x 28 threads) back in February of 2020, had to wait a considerable amount of time for it to come in. Decided on a suppressor later in the year and after ordering the quick detach device for my suppressor, it wouldn't screw onto the barrel. Griffin sent a second qd device and it wouldn't work either. So to verify the threads, i ordered a .578 x 28 Die to run over the threads. While this confirmed that the Fusion Firearms barrel did indeed have out of spec threads, it damaged the threads to a degree that Optics Planet will not take the barrel back. (Can't send back items if not in like new condition.) I would NOT recommend this or any barrel from fusion firearms if they cannot correctly thread a barrel. (Griffin Armament was very helpful in that they sent me a second qd devide after threading it onto a correctly threaded barrel at their business, for verification.)