Hatsan Jet 1 fitting a silencer adaptor and a silencer
Hatsan Jet 1 AIR PISTOL - Fitting a silencer adaptor and a silencer
Using a black anodised Best Fittings 1/2 UNF - 1/2 UNF adaptor (including thread protector) Productnumber 10J1-AL04
Without a silencer another youtuber showed 118 dB outdoors, which is the same level as a fire engine's siren, hearing damage very likely if you shoot indoor.
Haven't tested outdoor shooting without a silencer.
THIS IS AN AIR PISTOL - A PELLET PISTOL THAT RUNS ON CLEAN DRY AIR