Corrected entry: When the man at the beginning of the movie is shot, the bad guy attaches a silencer onto the gun, but you can hear a very loud bang when the trigger is pulled.
Correction: It just depends what version you watch. In the UK Vipco version its a loud bang and most of the sound effects are bad. In the Ultrabit edition the SFX are state of the art and a loud silenced bang is heard. It's all down to quality of the version.