M45 shotgun

The M45 Tactical Shotgun is a shotgun used by the United Nations Space Command.

Design Details
Much like any other shotgun featured in the Halo universe, the M45 TS is a special-purpose weapon used in any situation where the range of engagement is limited, over-penetration is not desirable, but maximum stopping power is required.

Trivia

 * The M45 TS is more powerful than the M90 Close Assault Weapon System in Halo 3 since Bungie has stated in a Game Informer interview. The rounds will now be packed closer when fired and the range has been improved as well, although this will make it harder to hit more than one enemy at close range. The ammo capacity from the Halo 3 version has been kept.
 * In the build showcased at E3 2010, the M45's sights are now pink-red instead of the traditional blue-green.
 * It is possible that Bungie named this shotgun the M45 because its successor is the M90; 45 is half of 90.
 * There is an interesting inconsistency with the M45. Though it uses the same ammunition as the M90A, its barrel is noticeably shorter. Normally, this would result in a wider choke, allowing a larger spread of buckshot and a shorter range. However, the opposite happens, a longer range and tighter spread. This may be because of a narrower choke or fewer, heavier pellets being used.