So, I am late to the game. I will be getting a good basic mil-spec AR kit next week. The included barrel (all PSA) is a 5.56 1:7 twist with a mid-length gas block. I doubt I will try cast in the 1:7 barrel, but will let the kids shoot it with my bulk handloads. I do intend to build a cast upper, likely over winter and will be ready to start testing in the spring. I will try to find a 2 stage trigger, an adjustable gas block (Odin) and a more suitable barrel. There in lies the question...
I would like to find a 1:10 twist 18 to 20 inch with a rifle spaced gas block port. I am sure I am not the first to look for this, but I know there are folks here who have already done this... What is a decent barrel manufacturer for a barrel like this?