Got a barrel from another builder. After inspecting it, it looks like its from the initial APEX offering. The journals were too small. I cut the barrel off right past the front sight journal.
I sent the barrel to Morgan Richey at class 3 machining in Texas. and had him knurl the journals and thread 1/2x28. the barrel is 12 5/6" long there is .55" of thread. very happy with the work
the barrel pressed in perfect and I used a #16 drill bit to drill the barrel pin. right now its standing at .020~ bolt gap, it will change after its welded in the receiver
last pic of barrel mocked up in the kit