Hi I have decided to quieten my CP88 which deliveres a good sounding crack when fired its one of the older shiney models so I purchased a Brocock branded adapter from a well known E**Y supplier now having fitted it along with a silencer very quiet pistol but very poor performance compaired to before I have checked the inside of the silencer to see if any visable signs of pellet marks some visable but only slight.When fitting a silencer to a rifle I counted equal turns on the grub screw and had no problems with either power loss or being able to hit what I was aiming at,lost