npc_sentry_ground

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npc_sentry_ground is a point entity available in  Black Mesa.

They are the turrets placed by the HECU in the military bombardment chapters. They attack anyone, including the HECU themselves. The player can pick them up and use them as a weapon, they run out of ammo pretty fast though.

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  The turret in-game.

Note:Some keyvalues, flags, inputs, or outputs might not affect an NPC, based on the functionality and coding of the NPC.