Hello,
I have a Rainier Arms match 18" 223 wylde, midlentgth gas barrel. It's been assembled and taken back apart and put in a parts bin for last few years. Its unfired with handling and assembly marks.
https://www.rainierarms.com/rainier-arms-match-223-wylde-barrel/$175 shipped, discrete pp f&f, PM for pictures
Thanks for looking