XM25

The XM25 is a scoped, bullpup, air-burst grenade launcher that appears in Call of Duty: Modern Warfare 3.

Call of Duty: Modern Warfare 3
The XM25 functions differently from a regular grenade launcher - it essentially fires proximity grenades which detonate as they pass a nearby enemy, allowing the player to "airburst" grenades. The grenades also have a linear trajectory. It's a fully-automatic grenade launcher, with a capacity of 4 rounds.

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Singleplayer
This weapon is first seen in the campaign mission "Black Tuesday."

Multiplayer
The XM25 is unlocked at Level 52 in Call of Duty: Modern Warfare 3's multiplayer.