If I remember correctly, I am supposed to put the barrel into a receiver, install the bolt and the muzzle device, and then use a dowel down the barrel until it hits the bolt face to get the barrel length. Problem is my upper has not arrived yet. Can I stick the bolt face into the barrel and then do the same procedure? It I am at 16" I should be good right? Going towards the city is where I can have the muzzle device pined, so hoping this way of measuring will work.
Edit:
Just measured it this way and came up wit 16 -1/16"