Very nice build! Hopefully you and I can use our firearms again soonYou're talking about the more modern version, which is carbine or mid-length. In those you're correct, the fsb is not part of the gas system
This one is a true dissipator, and yes it works.
Bayo lug interferes with a proper dissipator length barrel, and swivel always seemed unnecessary to me. Slip ring could arguably be either style, I chose the early parts for the vibe.