OK. I bought my first AR yesterday. I was reading through the operations manual and all through it .223 is highlighted in yellow. It is stamped .223/5.56. While going through and learning how to break it down I noticed the underneath of the barrel is stamped 5.56 1-9. I'm assuming it's fine to put both through it?? I know, dumb question, I'm a noob, LOL.
I tried searching through the forums but I don't think I was wording the search right to get the answer I was looking for.
Thanks in advance.
Answered recently here as well:
https://www.indianagunowners.com/forums/long_guns/149066-223_5_56_a.html