Kandar CP1 silencer

This is a bull barrel silencer for Kandar CP1 aka SPA CP1, .22 inch
If the .177 inch barrel has an outer diameter of 12 mm, then the silencer should fit on it,
but it will work worse than on .22 inch

I made it with a front sight, but it's rather bad. I suggest using a scope/holo-sight/laser.

You need 1 "sdr21 cold water from PVC-U with a length of 300 mm.
It has an internal diameter of 29.5 mm and an external diameter of 33.5 mm

I don't know how to use openSCAD, so I can't create a p