A2 scope

"Huh... my ass! Well, you can forget about those adjustments on your A2 Scope..."

- A Master Gunnery Sergeant to Johnson, before being cut off by the elevator.

Not much is known about the A2 Scope, but that it was most likely a scoped weapon attachment and was mentioned by "Master Gunns" during The Armory Level on Halo 2. "Master Guns" had said that Avery Johnson would not be receiving adjustments to said device after he inquired on how Johnson had survived the detonation of Alpha Halo, and the Sergeant Major responded by saying it was classified.