M45 shotgun

The M45 Tactical Shotgun, formally known as the Tactical Shotgun, 8 Gauge, Pump Action, M45, is a shotgun used by the United Nations Space Command Army.

Design Details
The M45 Tactical Shotgun is a special-purpose weapon used in any situation where the range of engagement is limited and when over-penetration is not desirable, but maximum stopping power is required. Like the M90 Close Assault Weapon System, the M45 is a pump-action, magazine-fed (dual tubular, non-detachable type) weapon that uses 8 gauge magnum (3.75”) ammunition. It features an adustable stock, however this is purely cosmetic.

Gameplay
In gameplay, the M45 Tactical Shotgun is more powerful than the M90 Close Assault Weapon System from Halo 3 and Halo 3: ODST. The pellets have a tighter grouping and the range is superior as well, which also makes it harder to hit multiple enemies at close range.

Trivia

 * It is possible that Bungie named this shotgun the M45 because it is the in-game counterpart to the M90 from the other games: 45 is half of 90.
 * In the Halo: Reach Multiplayer Beta, the shotgun had cyan lights similar to those on the M90 in Halo: Combat Evolved and Halo 3. The sights are red in the final game.

List of appearances

 * Halo: Reach