XM25

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

Singleplayer
The weapon appears in the first campaign mission, "Black Tuesday." It also appears in the spec ops mission "Flood the Market". It differs from the multiplayer XM25 in that it is bolt-action rather than semi-automatic, and it doesn't require the player to lase a target for airburst, as the grenades automatically explode when they are in proximity of an enemy.

Multiplayer
The XM25 is unlocked at Level 52 in Call of Duty: Modern Warfare 3's multiplayer. The XM25 functions differently from a regular grenade launcher - when the player aims down the sights, they can mark the distance to the point they are looking at by pressing the sprint button. After a distance is marked and the player shoots, the grenade will explode upon reaching one metre past that distance. The grenades also have a linear trajectory. It is a semi-automatic grenade launcher, with a capacity of 4 rounds.

Damage-wise, it is almost completely incapable of killing an uninjured opponent in 1 shot, as it's sometimes possible for targets to survive even direct hits, making one-shot kills extremely unlikely. Therefore, multiple shots are frequently required to take out a single enemy. The aiming system allows for a user to fire it through windows to dispatch of any enemies seeking cover behind the sides of the window, making it excellent at eliminating snipers firing from windows. The rate of fire possible allows it to kill any targets that it indirectly hits in a short amount of time over long distances. Despite the decent rate of fire, it is not advised to use the XM25 in close to mid-range in open areas, as without a direct hit, most conventional weapons will be able to kill faster.

Achievements/Trophies
This Is My Boomstick (20, Bronze Trophy) - Kill 30 enemies with the XM25 in "Black Tuesday".

Trivia

 * On Black Tuesday, the player can hold his breath while aiming down the scope of the XM25, just like a Sniper Rifle.