Airsoft guns are modelled after real firearms. Manufacturers give their best efforts to achieve this realistic look and feel, from the gun measurements to its outer features. MP5 is one of the first popular sub machine gun to become popular in the airsoft community. Airsoft guns can be separated into three groups that are determined by how they are powered.
Spring models are airsoft guns that require you to pump or cock the weapon every time you fire it. Spring-powered gun is usually made of plastic and can fire from 150 to 350 FPS depending on the spring design and the BB weight.
Gas airsoft guns are often used only once a round and are usually saved as a side arm or assist weapon. The gas or C02 usually only lasts the duration of the clip and a lot of the time your shots will not be consistent.
Electric airsoft guns are more powerful and usually have the best accuracy. 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. These high-grade AEG's are usually made of metal, can fire upward of 450fps and are designed to perform under harsh conditions.
MP5 submachine guns are now obtainable in over 120 different configurations. Fortunately, all MP5 stocks, except those designed for the MP5K series, are interchangeable. When equipped with only a plastic end cap with sling swivel, it is known as an MP5 A1.
The MP5A2 variant denotes a fixed butt-stock, bird cage flash hider, and SEF Trigger group. The MP5A3 is similar to the A2 but has a telescoping, collapsible butt stock instead of the A2's fixed stock. The MP5A4 designation means the MP5 has a fixed stock, 3-lug barrel for attaching various accessories, and an ambidextrous fire selector for a 3 shot-burst trigger group. MP5A5. The A5 is an A4 with a collapsible stock.
MP5K was designed with covert operations in mind to be easily concealable and maneuverable. The barrel was reduced to only 4.5 inches (compare to the A1's 8.85 inches) and the tubular extension above the barrel is shortened as well. The MP5 K PDW (Personal Defense Weapon) is essentially a modified MP5 K. A side folding stock was added for stability and accuracy and the cyclic rate increased to 900 rpm .
The MP5SD is produced exclusively by H&K in several versions: the MP5SD1 and MP5SD4 (both have a receiver end cap instead of a butt stock), MP5SD2 and MP5SD5 (equipped with a fixed synthetic butt stock) and the MP5SD3 and MP5SD6 (fitted with a collapsible metal stock).
