There is a spring that holds the storage lock down, right at the bottom of the flag. Make sure it's hooked in the slot in the frame just above the top of the cylinder bolt. You need the cylinder bolt out to see what's going on. If the spring isn't retained in the slot, the flag may pop up or flop around during recoil.
Those are great pix, better than we usually get. In pic 7, it looks like the flag spring is visible along the bottom. That could possibly be part of the frame, though.