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The Extended Mag appears in Call of Duty: Black Ops, and can be used on most weapons. The AA-12 in particular has a very small magazine by default, so Extended Mags is an extremely popular attachment for it, especially due to the fact that it doubles the capacity to 16 shells. The P90 is the only weapon which gains this advantage. This allows users to equip another first tier perk instead of Marathon like Sleight of Hand or Bling.
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While using Extended Magazines on the P90, a player can sprint for a longer period than normal (patched on PS3/X360, still possible on PC). The P90 becomes akin to a light machine gun with Extended Magazines due to its already large 50 round magazine being turned into a 75 round magazine, which allows the user to hold down choke-points, but has a much quicker reload than the LMGs. Extended Mags is less useful with assault rifles or SMGs, because most players tend to reload after each kill anyway, though it can be useful if the player does a lot of spraying. Light machine guns benefit greatly from the extended magazine as their already large magazine is doubled, and combined with their high penetration allows the player to sustain good suppressive fire. The attachment does not increase starting ammo capacity unless paired with Scavenger Pro. Generally, it increases magazine size by 50%, but with some weapons it can increase magazine size by a greater amount. The increase in magazine size that is given depends on the gun. 44 Magnum, Desert Eagle, Model 1887, Ranger, and the Riot Shield. It is compatible with all weapons in the game except for the launchers, the. It is unlocked by getting 40 bullet penetration kills while using FMJ rounds for primary weapons, or it is obtained by getting the last Marksman challenge for handguns, machine pistols, and shotguns. The Extended Magazines return in Call of Duty: Modern Warfare 2. The attachment is titled "Dual Magazines" but it just adds the ability to use two magazines as one, therefore doubling capacity from 32 to 64 bullets. It is by far the most-commonly used attachment on the weapon, as it allows constant firing for roughly eight to nine seconds. The MP40's Extended Magazines attachment is called Dual Magazines. The Box Magazine is available for the M1A1 Carbine and Type 100. It is the PPSh-41's most common attachment its high rate of fire means the smaller magazines need frequent reloading and also, the attachment is unlocked at the Marksman II challenge as opposed to the Marksman III challenge, meaning it is easier to unlock. It is unlocked after the Marksman III challenge for the Thompson and after the Marksman II challenge for the PPSh. The Round Drum is available for the Thompson and the PPSh-41. There are five weapons which accept Extended Magazines however, there are different variants of the attachment. The attachment doubles the magazine capacity of a given weapon. The Extended Magazine is an attachment available for all submachine guns and the M1A1 Carbine in Call of Duty: World at War multiplayer. 12 Call of Duty: Modern Warfare Remastered.6 Call of Duty: Black Ops: Declassified.
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