5 zerg research points
Equips bunkers with an automated gun.
The Shrike turret's range and damage is equivalent to a garrisoned marine without upgrades. The turret allows an empty bunker to defend itself.
The Shrike turret upgrade and the fortified bunker upgrade are mutually exclusive. The latter increases bunker hitpoints.
We have developed an automated turret that comes standard with all bunkers. This turret, which is based on our studies of spore crawlers, adds extra firepower to manned bunkers and also allows unmanned bunkers to contribute to base defense.
The following section contains information from a previous version of StarCraft II which is no longer valid.