In addition to double XP for standard level progression, the games are offering double weapon XP and double XP for Battle Pass tiers. This comes at a key time, as the Modern Warfare/Warzone Season 4 Battle Pass is about to end.
As such, now is your last chance to unlock the content in the Battle Pass (though its contents can also be purchased with real money at any time). The double XP period ends at 10 AM PT on August 4.
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Source: Game Spot Mashup