When you level up to level 10 you unlock kill streaks and have the option of unlocking one of the many available. From there on every 4 or 5 levels you can unlock another one.
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Once you become a Colonel you unlock the sentry gun engineer perk. It allows you to reload sentry guns faster and they start off with more ammo.
I is in a collectable crate or the kitchen sink scheme
It will because I've got a lot of experience with sentry guns. Some reasons why it won't shoot at an enemy: 1. They have the cold blooded perk on.
Achieve the ACR Mastery Challenge.
I don't know 2 be exact :) But it is a good gun :)
You give one of them your sentry gun find it and destroy it
you unlock that when you have unlocked every attachment and every camo for every gun in mw2
The Sentry G5241 14 gun safe weighs 170 lbs (according to the Sentry website)
Contact Sentry or a qualified locksmith.
When th ammo in the sentry gun reaches 0, then you can reload it. To reload, walk on top of the sentry gun and press the F key. I'm not sure if you can reload it when there is still ammo in it though, but you can try. When you reach the rank Colonel, once you set up a sentry gun, you will have double ammo for the sentry gun, and you can reload it faster.
You will need to contact Sentry or a good locksmith.