Weapon stats are the characteristics of your gun's performance in battle. Each stat represents one aspect of performance: Accuracy, Control (recoil), Portability, etc. Each part of your gun, as well as the type of gun (shotgun, sniper, etc.) effects these. For example, an unmodified M4 Commando will have less accuracy and control but higher portability than a modified M4 Commando with a vertical grip, elongated buttplate, and 14 inch barrel.