air venturi avenger moderator
thingiverse
I put the hole in 8mm according to the comments, I have not tried it yet but it is supposed to be for a .25 caliber only for airgun.
Download Model from thingiverse
With this file you will be able to print air venturi avenger moderator with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on air venturi avenger moderator.