hi buddy
i think your worrying to much there buddy,fix it to your air rifle and take it out to zero in low light,you should have a pin hole in the objective end to allow to zero in lowlight (dusk)
i cant see why your having a prob with it ,to be honest!
my vomz fits my AAS410K fine and no movement at all,i am just up loading some pics for you to see! have a look at the mount,its pretty much the same as your nvrs
regards
davy