Custom made silencer adapter for Hatsan Big Bore air rifles with M18x1 thread to attach your air gun silencer, and with M27x1 thread to fit the 28 mm O.D. shroud – for newer, 2018 models (Barrage, Bullmaster, Galatian and Hercules).
Material is steel, blued. With thread protector. Through bore is 14.5 mm (0.57″) wide. Knurling pattern may be different than the one on the pictures. Item is supplied without O-Ring.