These are photos of modern russian silencer "ATG" (автоматный тактический глушитель - rus) from my collection. Made by Izmash. Now this model of silencer in use of russian SSO (special forces) in Syria.
Russmilitary has some pics of a couple suppressors on there. Looks like they reused the tube layout and baffle stack layout from a pbs model. The baffles themselves and the mount looks to be the main change. Would like to see a couple closeups of the lever, it looks like the flat lever is some kind of takedown lock?
If the flat lever is same as regular PBS-1 it is just the ratcheting release to open suppressor body up, if that is what you are referring to. I have handled the real PBS-1 extensively and am quite familiar with it. Not sure about Rusmilitary copy. Usually ptica is very accommodating he is probably just busy right now
I'd be curious to know the diameter of the exit hole. My guess is that its diameter is bit larger, relative to the size of the bullet, than the suppressors commonly available here. It doesn't seem possible for a suppressor to be consistently and perfectly concentric to the barrel if its not actually mounted to the barrel - there will inevitably be variation from rifle to rifle because the front sight block/gas block is a cast part. Some threads will be dead on with the barrel alignment, others won't, so the suppressor has to provide enough clearance to allow for this variability.
Sorry myst. Pics will come in next couple of days. I've been busy dying lately. PBS-1 will not work without rubber baffle in place, it is what helps snug it up. There is a slot on PBS-1 as I can't see these other pics on this computer but slot on PBS-1 is for tab on rubber baffle.