It's almost like a special mount pic rail that accommodates the claw mounts on the rifle. With a pic rail you can mount rings that can accommodate a modern scope. It would end up looking like a cantilever in the reverse with the overhang in the rear.
Regardless it would be a custom job off of a...
Visually it's pretty clear there is a good recoil reduction. The magnum shrouded had a noticeable reduction in sound.
I guess functionally, those gasses are cooling enough on the shroud to reduce the pressure and thereby reduce the sound report as well as redirecting the gas forward. Witt...
So I figure if I invent "Salt Spray" to compliment the pepper spray, I could just spray myself down with both, so that bear at 1.5 meters appreciates the flavors I just enhanced.