Shotguns offer immense firepower at short ranges. However, due to their spread, they are almost useless at long range. Shotguns take up a full weapon slot.
CAW
An experimental shotgun that fired flechettes, and would have been the most powerful shotgun in the world if the project was not canceled during the eighties. One of the best weapons in-game due to its immense firepower, decent rate of fire and magazine capacity for a shotgun. This is one of the more difficult weapons to acquire, as its design specifications can only be acquired in Outer Ops missions (Namely in Outer Ops 57-60 and 65-68).
\tCAW Rank 5 [GMP 404720, R&D 97] - CAW Design Specs -> Outer Ops 49-52 and 57-60
M37
A pump action shotgun. A good choice for close range fire-fights. A fully upgraded M37 is equipped with a suppressor for taking out targets at close range without retribution. Another variant is a long-barrelled version. The long barreld version does not carry the same round upgrade that the M37's later upgrades contains, but the long barrel and stock ensures it to be more accurate and powerful.
\tM37 Rank 2 [GMP 31400, R&D 29] - M37 Design Specs -> Extra Ops 028 (Aldea Los Despiertos)
\tM37 Rank 3 [GMP 109730, R&D 52)
\tM37 Rank 4 [GMP 188960, R&D 67, INT 53)
\tM37 Rank 5 [GMP 358890, R&D 88, INT 88]
\tM37 (Long Barrel) Rank 4 [GMP 196600, R&D 69] - Becomes available after developing M37 Rank 3
M37(ACM)
The accurized model of the M37, with a scope and longer barrel and choke for shotgun power at longer ranges. It is upgraded from the long barreled variation of the M37. The accurized model fires shotgun slugs instead of buckshot rounds. Making it much more capable to take down opponents without penalty in comparison to the other buckshot loaded versions at long distance.
\tM37 (Accurized Model) Rank 5 [GMP 389450, R&D 94] - Becomes available after developing M37 (Long Barrel) Rank 4
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SPAS-12
A very reliable semi-automatic shotgun, great at close to medium range. It was originally developed in Italy. Its weight makes the gun alittle hard to use but the immense power it holds against groups makes it a force to be reckoned with. Highly effective against troops during vehicle battles. Used by escorts in the most difficult of armored vehicle, tank and helicopter battles making them a whole dangerous new threat along with the vehicle they accompany. It is only capable of semi-automatic fire. It is later used with the Gurlukovich Mercenaries as well as the NBC division of the Next-Generation Special Forces.
\tSPAS-12 Rank 3 [GMP 135190, R&D 60] - SPAS-12 Design Specs -> Extra Ops 62/Complete Mission
\tSPAS-12 Rank 4 [GMP 204240, R&D 71]
\tSPAS-12 Rank 5 [GMP 379260, R&D 92]
Twin Barrel
A double barreled shotgun that was originally designed for hunting purposes. Rank two saws the barrel and stock off, making it smaller, but kicking up the recoil. Ranks three, four, and five reduce the recoil, reload time, and weight. A powerful yet reliable shotgun.
\tTwin Barrel Shotgun Rank 1 [GMP 3960, R&D 12] - Twin Barrel Shotgun Design Specs -> Main Ops 3 (Bananal Fruta del Oro: Sorting Shed)
\tTwin Barrel Shotgun Rank 2 [GMP 28090, R&D 27]
\tTwin Barrel Shotgun Rank 3 [GMP 93810, R&D 47]
\tTwin Barrel Shotgun Rank 4 [GMP 162230, R&D 60]
\tTwin Barrel Shotgun Rank 5 [GMP 343610, R&D 85]
Twin Barrel (Rubber Slug)
A sawed off Twin Barrel shotgun firing rubber slugs. Fires rubber slugs that knocks out enemies. At higher ranks, its reload time is decreased. This weapon is ideal for a completion of the mission with no kills, while at the same time neutralizing very hostile enemies nearby quickly. Even at longer distances, the rubber slug variation does not suffer and is very effective on groups of people. It works against the Velocipreys in the monster hunter missions for a short time until they recover and need to be fire at again. Does not work on main Monsters.
\tTwin Barrel Shotgun (Rubber Slug) Rank 3 [GMP 147920, R&D 64] - Twin Barrel Shotgun (Rubber Slug) Design Specs -> Extra Ops 023/Complete Mission
\tTwin Barrel Shotgun (Rubber Slug) Rank 4 [GMP 204240, R&D 71]
\tTwin Barrel Shotgun (Rubber Slug) Rank 5 [GMP 353800, R&D 87]