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:
- BR85N Service Rifle: This is the Marksman configuration preferred by many Requiem veterans.
- M395B Designated Marksman Rifle
- MA5D assault rifle: This is the UNSC Marine Corps Interim Fireteam Support (IFS) configuration for intermediate-range combat and long-range suppression.
Concept art of the scope on a DMR for Halo 5: Guardians.