14 mm CCW / 1/2"-20 UNF, for airguns up to 5.5 mm (.22), length 137 mm Primarily designed to be used with pistols and revolvers – the Umarex SD5 suppressor looks great on any airgun. Suitable for 4.5 mm (.177) and 5.5 mm (.22) calibers, the 4-chamber system provides high sound suppression for all airguns, reducing the sound by 20 dB. The SD5 owes its high-quality appearance to its matte black CNC-machined aluminum housing. To maximize compatibility, the Umarex SD5 comes with two thread adapters (M14x1 left-hand and ½″-20 UNF). Technical data Caliber 4.5 mm (.177) Pellet 5.5 mm (.22) Pellet 4.5 mm (.177) BB Barrel thread 1/2"20 UNF and M14x1 CCW Length 137 mm Weight 70 g