Unsure if it’s a 500 or a 590, bottom receiver is marked 590, but the side doesn’t say 590, but it has a bayonet lug. _____ has a heat shield, tri-picatinny rail up front for a light, optics ready picatinny rail in the rear, mesa tactical pistol grip adapter (has storage in the grip), Magpul MOE stock on a hydraulic recoil buffer, these are like $200 by itself. (KynSHOT RB5100 Adjustable Shotgun Recoil Buffer) _____ 20” barrel _____ Asking $600 _____ I travel to Austin frequently and can meet up along the route