The AR-C Assault Rifle is a weapon found in Far Cry 5. It appears similar to a Remington R5 RGP or HK 416.
Far Cry 5 Edit
The AR-C seems to have two variants: The first is a standard Assault Rifle with full automatic firing mode. The second is equip with a Suppressor and a High Power Scope as well as being semi-automatic firing mode, being suited more as a sniper rifle.