Silencer (and yes, in this case it silences the shot) for CZ 200 series and Air Arms 200's. Has threading on the inside, would advise just drilling it out slowly. (I have threading for a silencer on my CZ, thus it's there.) It doesn't use the grubscrew thing, but you could drill through the side of one of the supports close the middle of the silencer.
This thing is huge. Fits quite far over the 15mm diameter barrel. For use on .177 cal/4.5mm model.
I also include the internal structure for these interested in the design.
The "camo" look was achieved by the use of a mix of ABS and acetone applied with an ear bud. It was done to seal the different layers so that it doesn't delaminate as easily.
Print with the disc down. Make sure it has a snug fit on the barrel.