The Chimera assault rife was not included when Modern Warfare 3 launched in October 2022 or in the Season 1 battle pass, but the developers were quick to announce it as coming during Season 1. It will be a short-range weapon based on the Bruen Ops Platform.
“With an integrated suppressor and slow, high-energy .300 BLK rounds, the Chimera is adept at close-quarters combat,” according to the Call of Duty blog. “Subsonic Ammo hides skulls from the enemy team.”
The Chimera AR will be available as part of an in-game store bundle and a weapon unlock challenge alongside the Mid-Season Update. That means players can either buy the weapon bundle with the premium COD Points currency or unlock it through gameplay when the Mid-Season Update releases sometime in December.
The bundle or the gameplay challenge has not been revealed yet, though how the M13B assault rifle can be unlocked may give a slight idea on how it is possible to get the Chimera without paying with real money.