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Extended Magazine is a 2nd specialization exclusive to shotguns, called the Extended Shotgun Magazine. It doubles its magazine capacity, but still carries the same amount of reserve ammo. This specialization is useful on shotguns like the USAS-12 and Saiga 20K, as both have problems with their default magazine sizes in tight and close combat.
"Extended Magazine increases the total amount of bullets in each magazine, giving more shots before you need to reload."
— Battlelog description
Extended Magazine is a secondary weapon accessory that increases a weapon's magazine capacity. The player still carries the same amount of reserve ammunition, unless the AMMO specialization is equipped. Extended Magazines are only available for Light Machine Guns, Shotguns and most PDWs.
High-Quality render of the MP7's 40-round magazine.