Does anyone have any idea how to position the shroud and guarantee proper gap on the cocking support without a barrel? Trimming everything back to where it was from the factory seems to have put stuff where it needs to be but I can't really check the cocking support / bolt carrier gap without a barrel I don't think. IIRC the G3 barrel sits about 0.015 proud of the aft face of the trunion, so it would create a bit more gap than just putting the bolt right up against the face of the trunion. I think. Or maybe I'm being a pedantic MF, or a dumbass, or both...
ETA: I did make a dummy barrel that is a tight fit into the trunion, and it is working great to keep everything aligned, but it's not extending through the trunion and contacting the bolt face. I didn't trust any of the measurements I got enough to set bolt gap so didn't even try. I wasn't thinking about the cocking support gap though.