I am looking for a barrel, 18-21 inches for a AR10 build. Lower will be an Armalite, I already have an Armalite ar10 a4 type, so to keep the magazine situation easy is why I have decided on a Armalite lower. Its main purpose will be tack driving and predator hunting. Number one thing is being accurate, a close 2 is carrying it all day hunting, so maybe a heavy fluted barrel 18.5 inches. I have looked at Noveske, but no others. Thanks ahead of time.