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As I am fairly new to the AR I figured I would post this queston: does anyone know if its possible to chop the barrel down on the Bushmaster super lightweight barrel, which has a diameter of around .570 towards the muzzle. It says only to use threaded FH and not a "pinned" style but even that might be iffy if it flares wider for the FH at 16". Some forums say its possible but figured id check here as well.