I was wondering if anyone knew how Doug Koenig's Bianchi Cup open pistol compensator functioned? Specifically, in watching the gun cycle, it looks like the comp is fixed to the shroud. I always thought that 1911 pistol action required the barrel and attached compensator to move back a short distance with the slide before the barrel link pulled the barrel downward out of barrel / slide lockup?
I am interested because I am building a Bianchi pistol and liked the shroud design on his gun (smaller in dimension than say the Protocall shroud, which would allow for a better hand wrap on the barricade grip).
Here is a video example: