There are SO many accuracy parts available. There are a lot of guys with small calibre AR's, .17 Rem. .17 Practical (.223 necked down) and .204's and .Tac .20's (.223 case blown out)
that shoot sub 1/2" at 100yards. These are used for coyote, fox and ground squirrel shooting in the States.
Some, are used for shooting hogs from choppers. Quite the videos of that on U-tube.
Here's one outfit that does it.
https://www.helicopterpighunting.com/