Activision has released a video for Call of Duty: Modern Warfare 3, which focuses on the game’s weapon proficiencies. The progression allows the player to customize the gameplay experience with weapon leveling unlocks, and using proficiencies which provide weapons with new attributes. Each weapon will contain an experience bar, so the better you get, the better your weapons gets as well. It’s all very interesting, and you can watch it below the break. Modern Warfare 3 is out on November 8.