From Halopedia, the Halo wiki
The scope has a range finder, and ammo counter.
Known applicable weapons
The following weapons have been seen to utilize this attachment:
On December 13, 2553, Frederic-104 utilised a MA5D assault rifle, where he stripped the weapon down for close-range engagement by removing the initially equipped Longshot sight and sound suppressor.
Halo 5: Guardians
List of appearances