Turrets (In-game)

Sentry guns are automatic, PC-Controlled weapons the player can buy and place. They will set to work whenever a zombie enters their range, and will start shooting at them. This is effective to cover areas the player can't reach while away in another area, and is very useful for ammunition conservation and backup fire. In and, they are already unlocked and ready to place. However in and, they need to be unlocked. They can be unlocked in the Workshop in SAS 2 and in the Courtyard in Insane Asylum.

SAS: Zombie Assault
There is two Sentry guns, the Light Sentry Gun and Heavy Sentry Gun. The Light costs $400, the Heavy costs $500.

SAS: Zombie Assault 2/Insane Asylum:
There are two types of sentry guns: the Vickers and ADWS (which stands for Area Denial Weapon System). The Vickers is considerably cheap, $4,000, and is good in the early stages. Even though the price of one is considerably low and easy to obtain, it is not advised to buy this. Against zombies and Clowns alike, it is weak and inferior to the ADWS. It is largely shunned by ADWS' because of their high Rate-of-Fire and power, although it still requires quite a bit of work to do with stronger zombies, it is very effective when used with the M60 or MG4. The ADWS sports a $10,000 price tag, which is a bit expensive.

SAS: Zombie Assault 3:
Sentry guns return in the sequel to SAS 2. The two are the GECAL 50 and the ADWS. The Gecal 50 costs $5,000, and ADWS' cost $10,000. The ADWS faces a lot of changes in SAS, being semi-automatic and having a fairly low RoF. It also has 250 shots in it, compared to the ADWS in SAS 2, where it had 1000 rounds (2000 if the Sentry Gun Engineer rank was unlocked). However, it's high damage remains. The Devastators are still a nightmare, as it can withstand or even exceed up to a full 5 ADWS' clip. The GECAL 50 is inferior in terms of power to the ADWS, but superior in terms of clip size and RoF. They can be put near a nest in Purge mode, allowing the player to defend them-self while it does the work. Do not waste too much money on them, though.