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So I planted 2 sentry guns.... Then an enemy Stealth Chopper came into the map... Both Sentry guns started to aim UP and shoot at the stealth chopper. Let's just say it didn't take too long for both of them to drop that chopper... What the hell CAN'T sentry guns do besides move around the map?
I knew FMGs would be OP before the game came out: http://www.gamefaqs.com/boards/995751-call-of-duty-modern-warfare-3/59204323