M320 GLM

The  is a single-shot hand-held Grenade Launcher and secondary weapon featured in Call of Duty: Modern Warfare 3, and the handheld version of the M320. It was first shown in the World Premiere Trailer.

Special Ops
The M320 GLM appears in the Special Ops missions Toxic Paradise, Server Crash, and Invisible Threat. Like the Thumper in Call of Duty: Modern Warfare 2, it can be fired from the hip only in Spec Ops.

Multiplayer
The M320 GLM is unlocked at Level 64 in Call of Duty: Modern Warfare 3's multiplayer. The M320 GLM is not commonly used because it doesn't have a large amount of ammunition, and its grenades cannot be resupplied with Scavenger if the enemy is not using the same Grenade Launcher.

It functions in the same manner as the Grenade Launcher attachment, except that it is standalone and must be aimed down sights to be shot, unlike in Spec Ops where it can be hip fired.

Trivia

 * It cannot be reload-canceled to have the grenade ready earlier, because the game will only actually load the grenade when the character closes the hatch.
 * The M320 GLM and M320 use different ammunition pools; they cannot share ammunition even though they are ostensibly the same weapon.