I got a 5R Milspec 223 Rem. It actually shoots pretty good for what it is. It's an honest 1/2" 5 shot rifle (with this nut behind the bolt). I was thinking about getting the barrel a new crown and if it would be worth the cost, still being a factory barrel. I was just kicking the idea around and going to what what y'all think. My other 2 5R barrels are custom and the carbon looks like a flower on the end to me. This one not so much.