Technician: Engineer Tier 3
Basic (3 pt): You can now select a less noisy version of the sentry guns, making them much less likely to be targeted by enemies.
Ace (6 pt): You can now toggle AP rounds on your sentry guns, lowering the rate of fire by 75%, but increasing the damage by 250% and allowing it to pierce through enemies and shields.


Engineering Basic does pretty much what it says on the tin, in that it unlocks the second, suppressed version of the Sentry Gun that has a lower chance to be targeted. Note that the Silenced Sentry Gun is technically a completely different deployable (although it gets all the same benefits from skills as standard Sentry Guns) and must be chosen in the inventory in order to be used.

While the Suppressed Sentry Gun is technically equipped with a suppressor, note that it does not behave as a player's silenced weapons would - Suppressed Sentry Guns are not effected by suppressor-related effects such as those of The Professional or Specialized Killing, and will alert guards and civilians in a large radius if it happens to spot and shoot a guard while in stealth.

Acing the skill grants all your Sentry Guns - both suppressed and standard - the ability to fire armor piercing ammo instead of their normal rounds. These bullets will punch through shields (except for those of Captain Winters and his brigade), the body armor of Maximum Force Responders ("Tans"/"Browns"), and thin walls. Sentry Guns will still have non-AP ammo loaded by default when placed, but facing your turret and pressing the interact key will swap between AP and non-AP rounds. Note that this will not be prioritized over other interactions, such as picking a lock, holding a bag which can be thrown, or picking up the sentry gun itself.

While set to AP rounds, the Sentry Gun fires at only a fourth of its normal rate, but each shot does 250% more damage, resulting in the AP firing mode having a DPS equal to 7/8 that of the non-AP rounds on average, not counting damage blocked by Shields. However, each AP round fired by a Sentry Gun takes just as much ammo as a non-AP round, so the ammo reserves of an AP sentry will last four times as long as a default sentry's.


While the Suppressed Sentry Gun is not really that spectacular, strategically-placed ones can still be useful when trying to thin out an enemy mob, with their lowered aggro rating making enemies less likely to target them during combat. This could be used to position them in more risky, but more useful, places, such as next to an enemy spawn point where cops must climb over a fence or rappel from a roof before being able to retaliate. Emphasis is still on less, however, as they will still be shot at if there are no players around or if they are closer to the enemy than the players themselves.

With Engineering Aced, toggling AP mode on suppressed sentries can provide the crew with "stealthy" Shield busters, allowing them to circumvent their greatest weakness at the cost of a significantly lowered fire rate.

AP sentries are ideal for situations in which the sentry will be far from the action, such as thinning out the herd at spawn points while the players work on a distant objective. Their ability to take down Shields makes them completely self-reliant against all enemy types but Captain Winters, and the greater ammo efficiency afforded by AP rounds will let them stay in the fight much longer before needing a reload.

Pairing Engineering with the aced versions of Jack Of All Trades and Tower Defense allows the player to bring a total of 6 Sentry Guns into any given heist.


  • Even though the Sentry Gun only ever fires AP rounds when told to do so while Engineering is aced, all Sentry Guns have AP rounds attached on the model upon deployment, even without owning this skill.
  • Considering the fact that the Kobus 90 (Or its real-world equivalent, the FN P90) which has been built into the Sentry Gun can not normally fire armor-piercing ammunition, numerous modifications must have been made to the weapon in order to allow it to not only fire AP rounds, but swap between AP and non-AP rounds without missing a beat.
Gameplay • Heists • Skills • Weapons & Equipment • DLC
Subtree Tier 1 Tier 2 Tier 3 Tier 4
Medic Combat Medic Combat Medic Quick Fix Quick Fix
Painkillers Painkillers
Uppers Uppers
Combat Doctor Combat Doctor
Inspire Inspire
Controller Forced Friendship Forced Friendship Confident Confident
Joker Joker
Stockholm Syndrome Stockholm Syndrome
Partner In Crime Partners In Crime
Hostage Taker Hostage Taker
Sharpshooter Stable Shot Stable Shot Rifleman Rifleman
Marksman Marksman
High Value Target High Value Target
Aggressive Reload Aggressive Reload
Ammo Efficiency Ammo Efficiency
Shotgunner Underdog Underdog Shotgun CQB U100 Shotgun CQB
Shotgun Impact U100 Shotgun Impact
Far Away Far Away
Close By Close By
Overkill Overkill
Tank Thick Skin Resilience Die Hard U100 Die Hard
Transporter U100 Transporter
Shock And Awe Shock And Awe
Bullseye Bullseye
Man of Iron Iron Man
Ammo Specialist Scavenger Scavenger Bulletstorm Bulletstorm
Portable Saw Portable Saw
Extra Lead Extra Lead
Carbon Blade Saw Massacre
Fully Loaded Fully Loaded
Engineer Third Law Third Law Sentry Targeting Package2 Sentry Targeting

Eco Sentry Eco Sentry
Engineering Engineering
Jack Of All Trades U100 Jack Of All Trades
Tower Defense Tower Defense
Breacher Hardware Expert U100 Hardware Expert Combat Engineering Combat Engineering
Drill Sawgeant Drill Sawgeant
More Firepower More Firepower
Kickstarter Kickstarter
Fire Trap Fire Trap
Oppressor Steady Grip Steady Grip Heavy Impact Heavy Impact
Fire Control Fire Control
Lock N' Load Lock N' Load
Surefire Surefire
Body Expertise Body Expertise
Shinobi Chameleon Chameleon Cleaner Cleaner
Sixth Sense Sixth Sense
Nimble Nimble
ECM Overdrive ECM Overdrive
ECM Specialist ECM Specialist
Artful Dodger Duck And Cover U100 Duck And Cover Parkour Parkour
Inner Pockets Inner Pockets
Dire Need Dire Need
Shockproof Shockproof
Sneaky Bastard Sneaky Bastard
Silent Killer Second Wind Second Wind Optical Illusions Optical Illusions
The Professional The Professional
Low Blow Low Blow
Silent Killer Specialized Killing
Unseen Strike Unseen Strike
Gunslinger Equilibrium Equilibrium Gun Nut Gun Nut
Akimbo Akimbo
One Handed Talent One Handed Talent
Desperado Desperado
Trigger Happy U100 Trigger Happy
Revenant Nine Lives Nine Lives Running From Death Running From Death
Up You Go Up You Go
Swan Song Swan Song
Feign Death Feign Death
Pistol Messiah Messiah
Brawler Martial arts Martial Arts Bloodthirst Bloodthirst
Pumping Iron Pumping Iron
Counter-Strike Counterstrike
Berserker Berserker
Frenzy Frenzy
Legacy Skills (Update 39) • Legacy Skills (Update 100)

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