It’s called 22 long rifle…
Loading a 223 subsonic just makes no sense.
Pretty hard to find 80gr VLDs in 22 Long Rifle.
Many will recall the article Mule Deer did back during the last dearth of .22 ammo. He cobbled together a bunch of RF-equivalent loads for CFs. Good stuff, but now good .22s are widely available for $.08-.09 a pop, less than the delivered price of primers. End of story.
There are some good uses for reduced loads in .22CFs, but under current conditions, not for fun or cheap practice. One of those adapters looks like the hot setup for an AR.
Yeah, I need to look into a .22 LR conversion kit.
As Shane posted the larger bore and tighter twist of most modern ARs can be hard on 22 LR bullets when using a conversion kit. It might work just fine for your application but subsonic loads using long .224 bullets might shoot better and offer better performance as the distance increases.
