The AK47 looks very different compared to MW2 and to an extent, Call of Duty 4. The rifle has its wooden furniture, stock, and pistol grip, lacks a muzzle brake and has a different iron sight. It is seen frequently being carried by Viet Cong, NVA, and Soviets. It is found in all missions except for 4. Notable exclusions are Operation 40 and The Defector, where it is replaced by the FN FAL, and in "Rebirth" and "Redemption", where it is replaced by the AK74u. In S.O.G. and Payback, one can find an AK-47 with an attached Flamethrower.
Similar to the MP40 in the WWII-based Call of Duty games, the weapon is carried by many enemies and will therefore have more readily-available ammunition than its player-allied counterparts. However, the M16 will generally start with at least 600 rounds so it is a mostly personal choice. Also, in campaign, the M16 is full-auto, increasing the similarity.
The AK47 is unlocked at level 38, costing the player 2000. The rifle is a high-damage, fully-automatic weapon firing at a rate of 750 RPM, identical to the Commando's range and rate of fire. However, the AK47 has a slightly longer reload than the Commando. Its recoil has a predictable upwards pattern, resetting itself before the next shot. This can make it somewhat difficult to stay on target at medium to long range, but it is a devastating weapon at close to medium ranges. Its fire rate is moderate, yet the fact that most players burn through ammo make any of the magazine attachments help. The AK-47 is moderately popular gun online, especially on small to medium sized maps.
In the Zombie game modes, it is possible using the "give all" cheat to obtain a number of weapons, which includes an AK47. This version of the weapon, however, does little damage and has no firing sound. It also is featured in the poster for Call of The Dead, also if you look closely in the Call of the Dead poster there is a grenade launcher attachment.