How do you change your weapon on call of duty during a game?

To change your weapon in Call of Duty during a game, you can use the quick-switch feature by pressing the designated button for your secondary weapon (usually the "2" key on PC or the "Y" button on Xbox and "Triangle" on PlayStation). If you want to select a different primary weapon, you must either pick up another weapon from the ground or switch to your loadout using a loadout drop, if available. Additionally, you can customize your loadouts in the game's menu between matches.