Howdy Again
Although I have not fired mine yet, I can make a couple of comments.
Definitely takes getting used to, pulling the lower 'cocking lever' with the middle finger, then pulling the trigger with the usual trigger finger. That is the only way that is comfortable for me, much too awkward to cock the hammer with the normal trigger finger and then reposition the trigger finger to drop the hammer.
As was stated in the video, the gas seal bit is not very effective.
Each chamber mouth has a bevel cut into it.
When the cylinder slides forward, the rear of the barrel slides into the bevel of the chamber mouth.
This serves as part of the locking system for the cylinder. There are no conventional locking slots on the cylinder as with most revolvers. There are notches cut into the backing piece of the cylinder. There is a spring loaded bolt of sorts mounted in the bottom of the cylinder window of the frame. When the cocking lever is pulled back the cylinder slides back withdrawing the chamber mouths from the rear of the barrel, allowing the cylinder to turn. When the cocking lever is released prior to a shot, the cylinder slides forward again, engaging the next chamber mouth into the rear of the barrel. Interestingly enough, at this point, the bolt is only engaging the locking notches at the rear of the cylinder on one side. As can be seen int the photo below, the notches on one side are cut short. and only engage the bolt on one side. I'm not really sure why it was done this way, but at this point, the cylinder could rotate back if the chamber mouths had not 'swallowed' the rear of the barrel.
Perhaps no conventional cylinder locking slots to avoid Colt's patents, but other contemporary revolvers had them.
Anyway, if I ever get around to firing it, I do not expect pin point accuracy because somebody decided to file down the rear sight flush with the frame at some point.