The AK-47 fires powerful rounds and is the most powerful assault rifle available in the GTA III Era games. A headshot will blow the target's head off. It does, however, have a low rate of fire, and suffers from tremendous recoil and accuracy problems with long range. It is a common sight in the hands of many gangs on the later missions throughout the games. The AK-47 does not appear in Grand Theft Auto: Vice City, being replaced by the Ruger.
In GTA IV, the AK-47 is referenced in-game as the Assault Rifle. It can be purchased from the back-alley gun shops for $3,500 and each additional magazine costs $80. It can also be purchased from Little Jacob for $2,450 with each additional magazine costing $55. Like almost all other guns, this a 1 headshot kill in single player and in multiplayer, a 2 headshot kill. It is the starting weapon when the weapons are set to assault rifles. This CANNOT be fired from a car, however it can be fired by a passenger in either a helicopter or boat. While the AK-47 is good, the M4 is probably better - the AK-47 has greater power but the M4 has greater accuracy and a slightly better rate of fire. The AK-47 is in 'poor weapons' range while the M4 is in the 'advanced' range. The extra firepower is not much in comparison to the M4 and is not required much since a single headshot from any weapon will kill any enemy in GTA IV (they are easy to pull off) and since the M4 has greater accuracy it is better if the player aims for the head.
GTA III (2001): The GTA III version of the weapon is the Romanian WASR-2 (note the magazine) and is mostly accurate, but appears smaller than it should be.
GTA San Andreas (1992): The GTA San Andreas version of the weapon is a Norinco Type 56. It is often used in Gang Warfare. The model strangely enough, is significantly larger than it should be, being two-thirds as long as Carl Johnson is tall (also the HUD in San Andreas shows a AKS-74 rather than a regular AK-47).
GTA Liberty City Stories (1998): The Liberty City Stories rendition is accurate, both by size and look.
GTA Vice City Stories (1984): This rendition is exactly the same as the Liberty City Stories rendition.
GTA IV (2008): The version in-game is the AK-47. Its is accurate is size, look, magazine size and overall performance. The AK-47 is more powerful, but not as accurate as the M4. One should note, however. As with the Carbine Rifle, the rifle has two different reload animations, where Niko will simply pull the charging handle while standing. However, when he crouches, he'll do a longer animation in which he pulls out the magazine, inserts the new one, and then racks the charging handle, chambering a round. It could be an error in Rockstar Games
GTA Chinatown Wars (2009): The Chinatown Wars variant appears to be another Romanian AK-47 WASR, having the plastic pistol grip. The upper handguard of the weapon has been removed, revealing the gas tube. These details are shown when it is found in a Dustbin. The HUD Icon shows a normal AK-47.
GTA V (2012-2013): The AK-47 is replaced in Grand Theft Auto V by a Norinco Type 56-2, (a Chinese counterpart of the AK-47), evident by the folding stock and front-sights. It can be seen in the trailer with green synthetic furniture. There are various attachments on the weapon, which may indicate some sort of weapons customization.
Saint Mark's, Portland Island - In a secluded area behind Cipriani's Ristorante. From Cipriani's Ristorante, use the sidewalk on the south side of the block and head east. Proceed up the hill until you reach a driveway that cuts across the block. Go onto the driveway then turn west. Go to either the north or south of this building and continue west along the ledge. Go around the corner and proceed to the middle of the block. You should see a ramp leading down into the secluded area. The weapon icon is in the corner near the ramp and next to a body armor icon.
Trenton, Portland Island - On top of Liberty Pharmaceuticals (behind the large sign) near an adrenaline icon, a health icon, and a body armor icon. Jump from the elevated tracks near the northeast side of the large complex to access.
Fort Staunton, Staunton Island - Tucked beside a construction trailer underneath some ruins north of the sharp angled turn in the northeast part of the construction zone.
Red Light District, Portland Island - On a roof to the left of Paulie's Revue Bar. Run to the back of the club, go up the stairs and start walking towards the water tower and jump on that roof when you're close enough.
The AK-47 was cut from Grand Theft Auto: Vice City. The weapons model and textures still remains in the game files (ak47.dff and ak47.txd).
The AK-47 in GTA IV strangely has two reload animations. When Niko is standing while reloading, he will cock the gun with his left hand, but when he is crouching while reloading, he will take "out" the magazine, puts "another" one in and cocks the gun. It is unknown why two reloading animations are present. These two reloading animations are also present with the M4.