Airmaks katran owners - couple of questions

This gun shows great potential. I have a couple of questions I didn't find complete answers to. 1 -barrel / shroud , since it appears fastened only at the block is it susceptable to being bumped and resulting in POI shifts? especially the "long and XP " versions.

2 - Appears to need an adapter to mount a pic rail for a bipod , maybe a t-rail to pic adapter , seems airmaks has the accessories. 

3 - lastly , does the integrated mag holder come with all models? or just the compact version , don't see them listed in description of other models , but plainly seen with the compact version. 
 
The mag holders are on all the new katrans the reason you see it on the compact and x hp models is because they are the newest. As far as the other models just ask the distributer before you buy because if they have had the guns in inventory for a while they will not have the mag holders but if they were just built they will have been built with the new updated butt stocks.