I have 3 barrels from
www.masdefense.com , I can't speak of the quality of the latest since I haven't shot it yet, but really love that company. hard to find better prices and availability of sizes then MAS, quality on my purchases have been top notch, strong rifling, polished ramps and chambers and proper contours.. I know you already ordered, but check them out next time. plus, every AR I have gets one of their slick-side uppers.
I am not saying the are kreiger or shielen or anything, but they are solid barrels for the $$ and have been accurate, long lasting and reliable
also, I just bought their new LPK, was excited to see the enhanced hammer and matte finished trigger parts for about 10 bucks less than most other LPKs. a bit heavy pull, but really short travel compared to mil-spec. I think my heavy pull may be attributed to my floor on my lower not being milled low enough, making increased pressure on the spring, so may be my fault. I was about a 1/10th short when I milled out the trigger area