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The subject of this article appears in Call of Duty: Infinite Warfare

"Equip an additional attachment for your Primary weapon."
— In-game description.

Primary Expert is a Loadout Option in Call of Duty: Infinite Warfare. It allows an additional attachment on a player's primary weapon and can be equipped up to three times, allowing a maximum of five attachments and an optic. This option does not need to be selected separately from any additional attachments, but adding a third, fourth or fifth attachment costs 2 allocation points each. Each Primary Expert slot is unlocked separately, with slots being unlocked at levels 13, 27 and 39.