Airsoft guns can be categorized into three distinct groups that are determined by how they are powered. Gas, electric and spring powered weapons are the most common and all have their own advantages and disadvantages.
Spring-powered are airsoft guns that require you to pump or cock the weapon every time you fire it. They are very dependable during close ranged combats. The spring version is usually made of plastic and can fire from 150 to 350 FPS depending on the design and the BB weight.
Gas airsoft guns are often used only once a round and are usually saved as a side arm or secondary weapon. Automatic gas guns tend to be "pellet hoses" in which ammunition is sprayed all over the place without any accuracy or consistency.
Electric airsoft guns are more powerful and usually the most accurate. Many electric guns come with a hop up system that allows you to lay down a consistent accurate line of fire until your clip runs out. Batteries usually take 5 to 8 hours to charge the first time but any time after 3 to 5 hours would suffice. These high-grade AK-47 AEG's are usually made of metal, can fire upward of 450 FPS and are designed to perform under harsh conditions.
Airsoft guns are fashioned after real firearms. Companies go to great lengths to achieve this realistic look and feel, from the gun measurements to its external markings. The AK-47 is a very effective weapon with great power, has a very high rate of fire, and comes at a very reasonable price. Simple to operate, clean and repair, and having 290 FPS with 70-round ammo capacity for standard mags and 600-round for high-capacity mags, getting into the game with AK-47 is enough you the better part of the day.
AK-47 1948-51, 7.62x39mm - The very earliest models, with the Type 1 stamped sheet metal receiver, are now very rare.
AK-47 1952, 7.62x39mm - Has a milled receiver and wooden butt stock and hand guard. Barrel and chamber are chrome plated to resist corrosion. Rifle weight is 4.2 kg (9.3 lb).
AKS-47 - Features a downward-folding metal stock similar to that of the German MP40, for use in the restricted space in the BMP infantry combat vehicle, as well as by paratroops.