Maybe spend the extra $ on a well known manufacturer - TRYBE Defense Medium Profile AR-15 Barrel, 5.56x45mm NATO

First, there is a dip on the edge of the shoulder where the mil-spec gas block meets the barrel. I'm not sure if that's supposed to be for some sort of oring, but if it is, two things-- one, it changes the distance (roughly by 1mm) which makes lining up the gas block very difficult, two, they do not send the oring with the barrel. Also, I'm almost certain that the gas port is off by nearly 2deg from dead center top of the barrel. This has made a very frustrating day at the range. I would have spent the extra $ on a well known barrel, cash that I wasted on ammo trying to get the gas block adjusted and never did. Would not recommend.