Vehicle Features/Mounted Weapons

Ever since the Grand Theft Auto series introduced armed vehicles, these also featured Mounted Weapons.

Description
Vehicle-mounted weapons can be represented as any device incorporated in a vehicle that can be activated to shoot any kind of harming element, usually a projectile. These weapons generally disable hand-held weapons for Drive-By Shooting, but makes up for being stronger and having infinite ammo (in most cases). It should be noted that if the vehicle is destroyed, the weapon becomes unusable.

There are light-firepower weapons suited for rapid engagements, accuracy and close combat against small enemy groups, as well as heavy-firepower weapons suited against numerous enemy groups and vehicular destruction. The most common examples are machine guns, tank cannons and mounted rockets. The water cannon is not technically considered a mounted weapon, but its characteristics as an extra feature, the ability to harm pedestrians (albeit causing very low damage) and the ability to gain police attention still defines it as such in the GTA universe.

2D/3D Universe
In the 2D Universe and most 3D Universe games, vehicles like the Fire Truck, the Tank and the Rhino require extra command inputs to turn the mounted weapon to the left or the right to properly aim. However, they required some skill, as they lack a targeting reticle. In Grand Theft Auto: San Andreas, the aiming mechanic is simplified with the use of the camera control, making it a bit easier to adjust the angle of attack, though it still required some aiming skill due to the lack of a targeting reticle, especially on vehicles like the Hunter and the Hydra.

HD Universe
In Grand Theft Auto IV and Episodes From Liberty City, the aiming mechanic is the same as in GTA San Andreas, being used on the Fire Truck and the APC. However, the lack of a targeting reticle difficult the aiming on vehicles like the Annihilator and the Buzzard.

In Grand Theft Auto: Chinatown Wars, aiming is a bit easier thanks to the touchpad functionality of platforms like the Nintendo DS, along with marked lines to denote the direction of the gun.

Grand Theft Auto V retains the advanced aiming mechanic from previous games, but the addition of targeting reticles make armed vehicles easier to operate against a target. In addition, targeting reticles are adjusted with the same settings as for hand-held weapons, using either the regular dot reticle or the advanced one available for each class of hand-held weapons (using a rangefinding-like reticle for tank cannons).

Grand Theft Auto Online saw the introduction of mounted turrets in the Heists Update, available for the Technical, the Insurgent Pick-Up and the Valkyrie. Turrets operate the same way as any mounted weapon, but requires at least another player to use them, while leaving the driver/pilot at full control of the main vehicle. These vehicles are generally a great choice for situations where teamwork is a key element, requiring the driver/pilot to coordinate with their teammates and provide angle of attack if necessary.

Land Vehicles

 * Standard
 * Anti-Aircraft Trailer
 * APC
 * Armed Land Roamer
 * Armored Boxville
 * Blazer Aqua
 * Bruiser (Apocalypse, Future Shock & Nightmare) (Optional)
 * Brutus (Apocalypse, Future Shock & Nightmare) (Optional)
 * Cerberus (Apocalypse, Future Shock & Nightmare) (Optional)
 * Chernobog
 * Deathbike (Apocalypse, Future Shock & Nightmare) (Optional)
 * Deluxo (Optional)
 * Dominator Arena (Apocalypse, Future Shock & Nightmare) (Optional)
 * Fire Truck
 * Impaler Arena (Apocalypse, Future Shock & Nightmare) (Optional)
 * Imperator (Apocalypse, Future Shock & Nightmare) (Optional)
 * Insurgent Pick-Up
 * Invade and Persuade Tank
 * Issi Arena (Apocalypse, Future Shock & Nightmare) (Optional)
 * Menacer
 * Mobile Operations Center (Optional)
 * Mule Custom (Optional)
 * Oppressor
 * Pounder Custom (Optional)
 * RC Bandito (Optional)
 * RCV
 * Rhino
 * Royal Pain
 * Ruiner 2000
 * Sasquatch (Apocalypse, Future Shock & Nightmare) (Optional)
 * Scarab (Apocalypse, Future Shock & Nightmare) (Optional)
 * Scramjet
 * Slamvan Arena (Apocalypse, Future Shock & Nightmare) (Optional)
 * Speedo Custom (Optional)
 * Stromberg
 * S.W.A.T.
 * Tank
 * Technical
 * Technical Aqua
 * Terrorbyte
 * Tiger Tank
 * TM-02 Khanjali
 * Turreted Limo
 * ZR380 (Apocalypse, Future Shock & Nightmare) (Optional)
 * Heist-permitted (GTA Online)
 * Ardent
 * Barrage
 * Caracara
 * Comet Safari (Optional)
 * Dune FAV
 * Half-track
 * Insurgent Pick-Up Custom
 * JB 700W (Optional)
 * Nightshark
 * Paragon R (Armored)
 * Revolter (Optional)
 * Savestra (Optional)
 * Technical Custom
 * Toreador
 * Vigilante
 * Viseris (Optional)
 * Weaponized Tampa

Air Vehicles

 * Akula
 * Annihilator
 * Annihilator Stealth
 * Avenger (Optional)
 * B-11 Strikeforce
 * Buzzard Attack Chopper
 * Cuban 800 (Optional, Online)
 * Defender
 * Havok (Optional)
 * FH-1 Hunter
 * Hydra
 * LF-22 Starling
 * Little Willie
 * Mogul
 * Oppressor Mk II
 * P-45 Nokota
 * P-996 LAZER
 * Pyro
 * RM-10 Bombushka
 * RO-86 Alkonost (Optional)
 * Rogue (Optional)
 * Rustler
 * Savage
 * Sea Sparrow
 * Seabreeze (Optional)
 * Sparrow (Optional)
 * Thruster (Optional)
 * Tula
 * V-65 Molotok
 * Valkyrie MOD.0
 * Valkyrie
 * Volatol

Sea Vehicles

 * Coast Guard Launch
 * Destroyer
 * Kosatka
 * Kurtz 31 Patrol Boat
 * Predator (3D Universe)
 * Weaponized Dinghy

Mission Exclusives

 * Burrito (V mission Caida Libre only)
 * Cuban 800 (V Arms Trafficking Air only)
 * JB 700 (V missions Deep Inside and Pack Man only)
 * RC Baron (San Andreas mission Supply Lines only)

Grand Theft Auto V and Grand Theft Auto Online
{|class="wikitable" width="100%" ! width="30%" |General Stats ! width="40%" |Description ! width="30%" |Vehicles
 * colspan="3" style="text-align:center; background-color: black;"|Water Cannon
 * colspan="3" style="text-align:center; background-color: black;"|Water Cannon
 * Damage: Medium
 * Range: Medium
 * Fire Rate: N/A
 * Rotation angle: 360 degrees
 * Elevation angle: -5 to 20 degrees
 * The Water Cannon is a device that creates a large gush of water, intended to extinguish fires. Unlike in former games, the water cannon can be deadly against NPCs and other players, requiring seconds of constant spray to cause knockback damage. However, it cannot push cars as easily as in GTA IV.
 * Elevation angle: -5 to 20 degrees
 * The Water Cannon is a device that creates a large gush of water, intended to extinguish fires. Unlike in former games, the water cannon can be deadly against NPCs and other players, requiring seconds of constant spray to cause knockback damage. However, it cannot push cars as easily as in GTA IV.

Drivers are unable to use or switch weapons, the latter being replaced by a tracking functionality that automatically aims at the nearest vehicle (occupied by NPCs or stationary) within a small radius (~15m), on a 90 degree coverage relative to the front (meaning any vehicle past 45 degrees from the vehicle's front is ignored). ! colspan="3" |Gallery
 * Fire Truck
 * RCV (able to add a passenger-controlled cannon)
 * RCV (able to add a passenger-controlled cannon)
 * colspan="3" |
 * colspan="3" |

General

 * Along with these weapons, there are at least five unusable weapons:
 * The ICBM's missile on the back (London 1969).
 * The Hunter's Anti-tank missiles next to the usable rocket pods (Vice City-Vice City Stories)
 * The Launch's Rear MG on the rear end (San Andreas).
 * The Rhino's roof mounted MG and Co-axial MG (GTA V).

3D Universe

 * In the BradyGames guide of Grand Theft Auto: San Andreas, the FBI Truck was originally depicted with a mounted gun intended for use by SWAT members.
 * AI-controlled Police Mavericks (3D Universe) use an invisible Machine Gun that can even destroy a Rhino. The player cannot use this machine gun, however.

Grand Theft Auto IV

 * In an early development for the Annihilator, instead of having four miniguns, there are only one minigun and the four stub wings are loaded with some sort of fuel tank.
 * Rockets fired from the Buzzard have an extremely long render distance for the explosion SFX. Even on consoles, the particle effects and smoke from an exploding rocket can be seen from well over the entire distance spanning from one end of the airport to other, far out of view of the actual helicopter itself. Furthermore, the explosion sounds for the rockets can be heard from incredible distances.

Grand Theft Auto V

 * The Buzzard Attack Chopper and the P-996 LAZER can select guided and un-guided rockets after the patch 1.16.
 * Most remote turrets, such as the Valkyrie's front gun, do not have an option to "change weapon" to reveal a HUD icon, as the remote camera feature already hinders the function.
 * Certain cars allow to change between the player's arsenal and the vehicle's weapon. The Nightshark only allows this if there is no window plating on it.
 * When in first person view, operating a turret does not produce severe shaking as in third person view. However, the reticle will remain relative to the vehicle rather than to the camera itself. This means keeping the aim while the vehicle travels on uneven terrain or flies recklessly is more difficult.
 * Certain turrets have a physical form of sight that players can actually use when switching to first-person view.
 * The MG and the Minigun from the Dune FAV have the Large Scope with a red dot, available as an attachment on Ammu-Nation. However, their usage is limited and is somewhat achieved when the player aligns the reticle with the scope itself.
 * Pickup-mounted machine gun turrets (Technicals and Caracara) have an anti-aircraft sight based on the DShK's one. However, it was simplified to have a four-needle layout and the second circle frame serves no purpose during its operation.
 * Gatling gun turrets employ a crosshair with a ring on the middle. The Half-track and the AA Trailer have a similar pattern on their sights, but the ring is smaller and there are no lines inside it.
 * The Half-track' stock turret features a complex targeting reticle with a at the bottom.