Sentry Grenade Launcher

The Sentry Grenade Launcher or simply Sentry, is a piece of equipment featured in Call of Duty: Modern Warfare 3 ' s Survival Mode and unlocked at Level 31 and costs $4000.

Overview
True to its name, the sentry is a moveable Mk 19 automatic grenade launcher that uses a shield that can be used as cover, making it devastatingly powerful compared to the normal Sentry Gun. As a downside, it is shorter, making it useless when stationed at a window and a hazard to itself and everything around it when it tries to fire.

It works well against groups of enemies which the minigun variant is vulnerable against but is ineffective against enemy air support due to its grenade's slow travel time but does tons of damage if it ever registers a hit. Its slow fire rate is also a liabilty against suicide dogs and fairly armored infantry that are constantly on the move. The shield is effective against light infantry and Chemical Agents, but it becomes inefficient and requires protection in later rounds.

It's strong explosive rounds have a huge blast radius, this may lead to many friendly-fire incidents on Delta Squads, Riot Shield Squads, and even on other players.