This is all 50 yards.  The difference between 100 FPS was pretty big bullet drop difference in this cartridge.  I moved sight up and down trying to keep rounds in center area.   So these are not 5 round groups on some...because after 1-2 shots I moved sight to get middle more.  Except the 1680 12.2 or N110 9.2 for example. 

this has NO SILENCER!  This is just muzzle device like flash hider.  Just to see what cycles and what doesn't.  Some people want a gun that cycles with and without silencer.  And the choice for that is already Obvious.  CFEBLK FOR SURE.  Possibly N120, we will see.