Clean it really good first, Get all the copper fouling and carbon out. You can’t tell how much it’s been shot by wear of any type other than looking in the throat with a bore scope. You would have to shoot a lot to wear out a 223 barrel, like 4 or 5 thousand rounds a lot. Clean it and try it, if your going to bed it and float it yourself I would do that too. If you have to pay someone and funding is limited shoot it after it’s real clean and see how it shoots.