M7S Caseless Submachine Gun

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“The suppressed M7 -- tears through armor and turns bad guys into chum.”

— Gunnery Sergeant Edward Buck, giving a run-down of the M7S in the Desperate Measures Video Documentary.

The M7S Submachine Gun^[1] or the Suppressed SMG, is a United Nations Space Command infantry weapon.

Design Details

A suppressor attachment located at the tip of the Halo 2-era SMG barrel.

The M7S is a variant of the M7/Caseless Submachine Gun. Although the M7 is primarily issued to vehicle crews, the M7S is a favorite of commando teams. Sustained fire tends to cause the muzzle to “walk” upwards as recoil compounds. It is a good weapon for stealth and hit-and-run missions.

Changes from Standard M7

The M7S is equipped with a SS/M 49 sound suppressor.
The M7S is equipped with a muzzle flash suppressor.
The M7S is equipped with a reflex sight that uses a miniature reticule, making it more effective in dark areas and general close quarters combat.
Similar to the Shotgun, a flashlight is attached under the suppressor off to the bottom left side of the barrel, but it is not usable.
The magazine capacity has been reduced from 60 rounds to 48.^[2]
The M7S can be fired while zoomed-in. The smart-link scope displays the sight image on the user's HUD (not the reflex sight).
It is more accurate at long ranges.
It deals slightly less damage.

Trivia

Miscellaneous

This is the signature weapon of the protagonist of Halo 3: ODST, the Rookie.^[3]
This is the starting weapon in most Halo 3: ODST Firefight levels except for Windward, where you start with a Sniper Rifle instead.
The Halo 3: ODST handbook states that the M7S is "a sound-suppressed variant of the M7 rifle." This could be a careless mistake, as submachine guns are not rifles. However, the handbook could be referring to the M7's rifled barrel.
The M7S is the first fully-automatic weapon in the Halo series to have a usable scope.
The M7S is the first scoped weapon that is not headshot-capable. The second is the Focus Rifle in Halo: Reach.

Featured

The M7S can be seen in the gallery section of the Halo Graphic Novel.^[4]
In Halo: First Strike, John-117 carries two M7S SMGs.^[5]
In Halo: Contact Harvest, Staff Sergeant Avery Johnson and his squad of Marines were equipped with M7S's during a raid of an Insurrectionist factory in the prologue of the book.
The M7S SMG first appeared in Halo 2 PC as an Easter egg on the Bungie-made map Example. The map's description is "This is just a small example of what you can do as a Halo 2 cartographer!"
In Halo: Helljumper, numerous ODSTs wield the M7S.