The Warzone patch notes for July 2 include the following changes: C58 (BOCW) - Recoil increased slightly FARA 83 (BOCW) - Recoil increased slightly XM4 (BOCW ... also has plans to push several ...

The XM4 is a free tier reward that you can get from the battle pass along with the new Control Field Operator Skill and a plethora of Skins, Weapons Blueprints, Vault Coins, and other items.