Does the FC version put tension on the barrel when you tighten the baffles The original kozak pulled tension when the shroud/baffles are tightened up by screwing them on. they have 2 set screws (1 on each side) of the barrel/airtube clamp to help hold it. But I have not held a FC model to know how they are built
My little Kozak compact is solid as a rock, even with Donny Tatsu on it. OK maybe not ROCK solid, but I don't have problems with poi change from normal bumps and handling
I don't think my POI moves with the occasional bumps but while your are shooting. If you let your hand press the shroud or lean barrel against door frame or tree or other it will move the POI. If you are not against anything it goes right back to original position and is dead on. My Kozak is not the FC model but the semi bullpup. At the end of the barrel there is a nut/ring with vents that holds the shroud and pushes it back toward the action. The mono-core silencer screws onto the barrel and holds another 6" shroud that covers the mono-core. I snagged a picture of core from someone on another link. This is my Kozak... Note the Athlon FFP scope is pretty bad ass also.