I’ve got nothing against the idea of a mostly printed dedicated ar22 barrel. I’ve got to go against the grain and ask: Is there a reason you’re opting for the traditional ar22barrel (im assuming its gonna be the typical profile) over a carbon fiber Proto-barrel? You’d only need the larger diameter of the two “required carbon fiber tubes” when making one from a chaszel barrel. The best part is its infinitely easier to remove the liner if you mess up or want repurpose the liner for a different project ( versus sticking prints it in a corrugated cardboard box to cook it with a Heatgun). If you want to use any muzzle devices it has coarse thread adapter that is much easier to deal with than the finer stuff like: 1/2-28, 5/8-24 when printed from PLA+/pro. If its something you just feel like doing or designing then go for it I wouldn’t mind seeing other barrel profile copies or even entirely new ones. However when taking into Consideration $20-ish (generally speaking if there’s two brands with seemingly identical options the one priced slightly higher usually will have a better finish) buys enough material to make at-least two (16"long) and as many as 6(5.5"long) (remember chaszel liners only use the 1x25x23x420mm tube in the BOM ) nothing else comes to mind that can elevate your project’s looks and (most often) performance for such a small investment in capital and time.

Make hole slightly bigger, try fitment. If too tight, try again. If too loose, try again. You gotta also account the space you need for epoxy. If threaded, use threads on chamber side for epoxy and 3/8-24 to 1/2-28 adapter on the other. It’s a 22, it’s gonna be strong enough to make hole .010” bigger.