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Rockstar Games confimed in the GI cover story that the Melee Combat in GTA V is "better than we had in the past." How far they can push it is depending on the "resources Rockstar allocate to it." But Rockstar also stated that even though the Melee Combat won't be as big of a deal as shooting (with the way they make the game), it will still be "really strong and fun" , stated by Dan Houser.
FistThe Fist has appeared in all Grand Theft Auto games, they mainly represent the unarmed state of the player. Fists are the first resort to fighting in early missions but will become useless as more deadly weapons will be introduced. A short fist fight was seen in the second GTA V trailer as a small clip shows Trevor bashing a guys head into the counter.
Batdog, holding a Baseball Bat. This one is wooden like in GTA III, GTA: Vice City, GTA Advance, and GTA Chinatown Wars.
Golf Clubs made their appearance in the 1st trailer, possibly returning once more as a weapon.
A Nightstick also appeared in the 1st Trailer when three LSPD officers were chasing a criminal. The weapon can be seen in the black police officers holster but it is unknown if it will be made available to the player as a melee weapon.
The Hammer was announced as part of Grand Theft Auto V special and collector's edition. It will be available via download.
In the GI cover story Rockstar Games stated that they've "envolved it on from where we had it in any previous game a long way. It's not just in terms of how it works, but also in terms of the core mechanics of how you play the game."
A handgun is also seen in the GTA V trailer where a member of the LSPD is seen holding one. It resembles a Glock. In most Grand Theft Auto games a weak handgun such as the Glock is usually the first gun the player will obtain. The real-life LAPD (which the fictional LSPD is based off of) issues a variety of weapons, quite a few of which are Glock models.
In previous GTA games, pistols were of little usage and quickly became rendered obsolete by other weapons. Considering how GTA4 made the Pistol much more useful and effective, it can be assumed this trait will be retained.
The Handgun is seen in a sceenshot which show Trevor holding it with a dead body near him. The Beretta 92FS is also one of the possible weapons of choice available to an LAPD officer
The Handgun is seen in a artwork which shows Franklin holding the gun. In the LAPD, it is usually only available to SWAT team and high-level ranking commanders.
The Desert Eagle can be seen in numerous cutscenes during the trailer released April 30, 2013, primarily in the Michael trailer.
The pistol was announced as an exclusive for the Grand Theft Auto V special and collector's edition. It will also be able to be downloaded for those who bought the normal version.
Sub machine guns
Mini UziMicro SMG based on the Mini Uzi is featured in a screenshot showing Trevor doing a drive-by on a Wet-Ski.
Mossberg 590In a screenshot you can see Franklin holding a Mossberg 590 shotgun.
A shotgun based on the Kel-Tec KSG will be an exclusive to Grand Theft Auto V special and collector's edition. It will be available to download for those who bought the normal edition.
AK-47AK-47 appears in the GTA V trailer, consisting a different layout. The AK in the trailer appears to be based on the Norinco Type 56-2, also the AK-47 seems to be more textured and more realistic. It has several accessories and modifications including a side-folding butt stocks, olive drab polymer furniture, side mounted lasers and sound suppressors, which leads to the possibility of weapon customization and modification in GTA V.
M4A1CAR-15. On the artwork it leaks the muzzle flash which is normally attached to the barrel. The top picatinny rail has an M68 CCO Aimpoint on it which is another hint to a possible weapon customization in GTA V.
On the Gameinformer magazine cover Trevor is seen holding a CAR-15 with an aimpoint sight.
This variant of the TAR-21 assault rifle appears in a screenshot named "Shooting Out Da Chopper". The gun has a rather undetailed skin, as the back iron sight of the gun is simply a solid object, and the front iron sight is missing. Unlike the previous screenshot, the gun does not have any attactment attached to it. However, the black part in front of the back iron sight could be an undetailed Picatinny Rail.
MinigunFranklin is seen using a Minigun in a screenshot.
Litter is shown a few times in the trailer and in screenshots which leads to the possibility that the player can pick up litter and throw it like in GTA IV.
The Molotov is seen in the second trailer when Trevor throws one into a house, causing a fire trail that made it explode.
Gas Canister and lighter
Gas Canisters can be used to douse objects in Gasoline and lit a match to ignite it.
Weapon customization and attachments
A Suppressor is seen in the first trailer which leads to the potential feature of suppressing weapons and possibly customising weapons to some extent. The purpose of a suppressor is to hush the sound of gunshots and dampen the flash from the barrel.
A Laser Sight is seen twice in screenshots for Grand Theft Auto V. In the two screenshots the laser sight is used by the Los Santos Police Department in a Police Maverick. The color of the laser emitted is red.
In an artwork, Trevor is seen on an ATV holding a rifle with a scope.
These Weapons are attached to vehicles and cannot be used on foot.
The unnamed fighter jet as seen in the first and second trailers and in one of the screenshots has missiles attached to it, which means it is very likely the Player can fire these missiles. They resemble ether the AIM-120 AMRAAM or AIM-132 ASRAAM air-to-air missile. It is interesting to note that the F-35 has internal ventral and centerline weapons bays, along with the outboard hardpoints, which though allowing for greater payload, would likely compromise the plane's stealth characteristics.
Also, if one looks carefully, one can see what appears to be the channel for an internally-mounted cannon, most likely an M61A1 or GAU-12/U-derived gun. Both weapons are multi-barrelled rotary cannons mounted on USAF and NATO aircraft like the F-15, F-16, F-18, F-22, and F-35. Since the fighter appears to be based off the F-35B (STOL) as the Hydra in SA was based off the Harrier STOL, it is likely that the cannon will also be used as a backup weapon.
Two fuel tanks can be seen on the innermost pylons of the fighter. These appear to be cosmetic and will have no effect on the plane's overall capabilities.