Weapons, like Operators, can also be leveled up and gain experience, which unlocks a whole arsenal of attachments, weapon perks, and camouflage that can be equipped though the Gunsmith.
Defeating foes with a weapon you have unlocked through progression grants you weapon XP for that particular weapon. Earn enough XP for that weapon, and it gains a level. Note that levels for weapons are entirely separate from player levels and ranks; you will rank up your weapons independently.
Each weapon level will reward you with a new attachment – for example, a Muzzle, Optic, or Stock – a perk, or a camouflage for that weapon. These attachments and camos can be equipped within the Gunsmith.
Camos earned by leveling up a weapon unlocks the base camo for that weapon. After earning the base camo, a set of camo challenges is unlocked, allowing you to earn a set of colorful and cool-looking skins within a camo set for that weapon. In addition, camo unlocks earn you XP rewards.
With each weapon averaging 50 available attachments and having over 100 earnable camo patterns (including a few extra camos for those completionists out there), there is plenty to earn and accomplish within Modern Warfare, even before the first season begins!
Post-Launch Content
Call of Duty: Modern Warfare is scheduled to have a number of seasons post-launch. Each post-launch season, which will have its own Officer Rank progression track, will bring a mix of new maps, modes, missions, community events, and other content to the game.