Shotgun

A shotgun, also known as a scattergun and peppergun, is a firearm that is usually designed to be fired from the shoulder, which uses the energy of a fixed shell to fire a number of small spherical pellets called shot, or a solid projectile called a slug.

Shotgun can refer to the following:

UNSC

 * DTM Series - A series of shotguns by Weapon System Technologies.
 * M90/M90A Close Assault Weapon System - A type of shotgun featured in most of the Halo games.
 * DTM/Law Enforcement
 * M45 Tactical Shotgun - A shotgun featured in Halo: Reach.
 * M45D Tactical Shotgun - A variant of the M45 featured in Halo 4.
 * Underslung Shotgun

Covenant

 * Type-52 Pistol - A pistol-shotgun favored by the Jiralhanae. Better known as the Mauler. Featured in Halo 3 and Halo 3: ODST.

Forerunner

 * Z-180 Close Combat Rifle/Asymmetric Engagement Mitigator - Used in the latter part of the Forerunner-Flood war. Better known as the Scattershot. Featured in Halo 4.