Sentry gun

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Sentry guns are automatic anti-personnel weapons in Just Cause 2.

In the Bukit Marmar Pecah military base. Note that the gun on the right is not active.

Description

They stand on a tripod and have 2 gun barrels and one camera.

A destroyed Sentry gun, on the roof of the PBC Tower.

Performance

When they are not active (aiming and shooting), their guns point to the ground, and they will make a slow beeping sound.

They see Rico when he gets to about 20 meters away. At that point they turn on and start shooting.

It takes them about 1 to 2 seconds to activate and aim, so they cannot start shooting instantly. This gives just enough time to make the couple of shots necessary to knock it over and thereby destroy it. However, if it should take you by surprise, you're in big trouble. They also overheat after a short period (though plenty long enough to kill you, if you do not take cover), so you can have multiple chances. In "Chemical Heist", for example, just walking back keeps them from hitting you, and you can attack it in the down time (or just drop a grenade on it).

There is no need to use bullets to disable such weapons. Just grappling a sentry gun and tethering it to something decently far away will make it go spinning and drop onto the ground, disabling it. It is advisable to take cover whenever you get shot by it during this so health can regenerate.

The fire is about as powerful as a minigun, but it is more accurate and therefore much more dangerous. They will still shoot at you even when they can no longer see you, which could mean that it has a motion sensor system located around it.

Panauan soldiers can safely walk around them. It is possible that the Panauan soldiers have radio beacons equipped on their uniforms. Devices like that are actual devices employed by special units, which work with automated weaponry such as a sentry gun.

Locations

• 2 in the center of the Bukit Marmar Pecah military base, surrounded by sandbags. There is also a spot of snow in the jungle, next to that base, at about X:11875; Y:8490. This is the only place you can see sentry guns outside of missions.
• 2 on top of the PBC Tower, during the Reapers faction mission "Pirate Broadcast". Bolo Santosi calls Rico and warns him about the sentry guns about 1 second before Rico gets with in range. Bolo likely knows this because she has spies in the Panau Military, who aided in setting up the sentry guns. After all, she mentions she has "eyes and ears everywhere" in the introduction sequence of "Rocket Science". It's also possible she is watching the situation through a telescope.
• At the Gunung Merah Radar Facility, during the Reapers faction mission "Can I get a Witness". It is inside the building, directly behind the door.
• In the two enterable labs at the Gunung Tasik facility.
• 2 are inside the U1 nuclear submarine. They are located just under the tower and can be heard when you are walking on top of the submarine close to them.
• At PAN MILSAT, during the mission "Taking Care of the Dishes".
• At the last "anti-aircraft cannon" that has to be destroyed during the mission "Into the Den," there are two of these guarding the cannon alongside a few Ninjas.

Trivia

• See the Wikipedia article about this type of real weapons.
• JC3 and JC4 have a few similarly small wall-mounted automated MGs at a few mission locations.