Apparently the cylinder (I'm NOT calling it a mag! And neither should anybody else, because if anybody in the Canadian process hears you....) has a collar the snugs up the cylinder gap, a la Nagant revolver (which was silenceable). I can't remember/find the article I've found most of my info from though...
Still, fingers cross for it to be a manually operated NR shotgun. Even having a NR long one, and a short one for... those special CQC carbine courses. lol