The Rugers have been out for awhile. I saw one at sportsmans 3 or 4 months ago.I bought a Howa mini barreled action in 6mm ARC and have a McGowen barrel on order (couldn’t get the factory pencil barrel to shoot to my standards). The Howa mini is great for all AR-length rounds. Wish it took non-proprietary mags however.
The Ruger American is supposed to come out in 22ARC soon, and takes AR mags.
Otherwise anything made for the Grendel will work with a 22ARC barrel.