M45 shotgun

The M45 Tactical Shotgun 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.

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 rounds are packed closer when fired and the range is superior as well, which makes it harder to hit multiple enemies at close range. Since the build showcased at E3 2010, the M45's sights now seem to be pink-red instead of the traditional blue-green seen during the beta.

Trivia

 * It is possible that Bungie named this shotgun the M45 because it is the in-game successor to the M90: 45 is half of 90.