12ga 22 adapter
thingiverse
it's an adapter, bruh. ream out hole with a 3/8 drill bit if your liner is 3/8 outer diameter. Don't make this without a steel barrel liner.
Download Model from thingiverse
With this file you will be able to print 12ga 22 adapter 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 12ga 22 adapter.