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Half-Life 2 Hints
What are these black gun things that are shooting up my antlions?
1 of 5: Those things are called sentry guns (or floor turrets).
2 of 5: They're like the autoturrets in the original Half-Life, in that they detect motion in front of them and fire at anything organic that moves (except Combine personnel).
3 of 5: They're indestructible, but very easy to tip over.
4 of 5: When you're close to one, knock it around with your gravity gun to overturn it.
5 of 5: WARNING: They fire off short "finale" bursts of ammo whenever they're knocked over. You don't want to get hit by any of that.
