Threads were not 5/8 as advertised - Rainier Arms AR Match 300BLK Barrel

I got this barrel to go from carbine length to pistol length gas to soley run subsonic suppressed. I installed the barrel the gas block and shroud and went to put the suppressor on and it was a no go. My old $80 Bear Creek Arsenal barrel was 5/8×24 the same as this one was supposed to be. I got the micrometer out and found that the threads were .017 too big. They were the correct pitch but the od was off. I know that I could have returned it and got a new one but I'd already waited almost a month and a half for it to come in. I ended up taking it to my local gun smith. He couldn't believe that QC let this get by them. He recommended sending it back. I decided to have them fix it instead because I didn't want to wait who knows how long for another barrel. Bottom line is I ended up paying more money than I should have out of my impatience yes, but also because Rainiers poor QC. I in no way blame Optics Planet for Rainiers lack of QC as I know Optics Planet would have taken it back and made it right.