Most recently manufactured 223 rifles are fine with 5.56.I’m not really concerned with the longer barrel. I was just thinking of a bolt action to match my A4 clone with the longer barrel. I generally load my ammo within 223 specs but options are nice.
Same for an AR...Not a bad idea. I was just thinking about the heavy bullets I use for my PSA rifle and I bet they'd work even better from a bolt action. On top of that, I could shoot for 6 months with a 30-round magazine in a bolt gun.