This ammunition is classified as ' caseless,' meaning it does not have a metallic casing that holds together the bullet, propellant, and primer. The SMG uses 5x23mm caseless ammunition, a radically different kind of ammunition than the kind found in other UNSC weapons. Ģ7 October 2015 Ammunition Main article: M443 Caseless Full Metal Jacket In this configuration, the weapon is designated as the M7S Submachine Gun. The SMG can also be affixed with a suppressor, flashlight, reflex sight, and smart-link scope. The stock is always retracted in games and has a maximum length of 62.7 centimetres (2 ft 0.7 in) when the stock is fully extended. The weapon is 47.4 centimetres (1 ft 6.7 in) long with the stock retracted. The SMG has a rifled barrel that is 15 centimetres (5.9 in) long. There is no ejection port due to the nature of the caseless rounds fired. The magazine release button is located between the red dots on the left side of the receiver and needs to be pressed before the magazine can be released. If it is first pulled back and locked, then it must be pushed forward in order to chamber a new round. Once the magazine is empty, the charging handle, although not illustrated in-game, can be either pulled back and locked or it can be fully cycled after a fresh magazine has been inserted. Once the first round is fired, the gases from previous rounds force the breech to rotate and chamber a new round. The charging handle is located on the right side of the gun and does not move when firing.

Prior to firing when empty, the bolt must be cycled to chamber the first round. The SMG has a polymer handle, folding fore-grip, collapsible buttstock, iron sights, and a titanium body. An example of this can be seen in the present day Fabrique Nationale P90 SMG. This rotates the vertically stacked rounds in the magazine 90 degrees until they align with the horizontal breech. Due to the odd horizontal placement of the magazine on the weapon, it can be assumed that the magazine utilizes a circular ramp where the magazine meets the breech. The M7/Caseless Submachine Gun is a fully automatic UNSC submachine gun that fires from a 60-round magazine which is placed horizontally on the left side of the weapon.

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