KFA-2 x2
From Halopedia, the Halo wiki
The KFA-2 x2[1] is a UNSC scope used on the M6B and M6D pistol sidearms. It has 2x magnification. It is a "smart-linked" scope that relays visual data directly into the user's HUD (Heads Up Display), and possibly functions like a small camera. This stands in contrast to normal optical scopes such as the one featured on the BR55 Battle Rifle, whereby the user has to look into the scope.
