I ran across a never fired, used. Remington 700 tactical in 223 yesterday.
I couldn't resist for a couple of reasons.

I don't care for AR style guns. I'm too old to be playing Rambo but if there is ever another stab at gun restriction, I think it will start with Ammo.

I can always buy black market 5.56. (Yes, its pretty easy to buy from Military people).

It's a fairly accurate round especially handloaded.