MP5

Heckler & Koch MP5 is a family of handgun pistols manufactured by German weapons company Heckler & Koch from the 1960s.

HistoryMP5 was introduced by Heckler & Koch (HK) in 1966, under the name HK54. This name is based on the old naming method HK: "5" for the pistol mitraliur, and "4" means caliber 9 x 19 mm. His new name came into use when it was officially adopted by West Germany for police and border guards, Maschinenpistole 5 or MP5. GSG-9, a border guard anti-terrorist unit, then introduced the MP5 to another Western anti-terrorist unit. 
VariantsHeckler & Koch has done a lot of modification improvements on MP5; the internal and external components of this rifle have changed considerably from the initial model. The first MP5 model is available with a fixed butt (A2) or folding stock (A3), and a variety of trigger configurations.
The next major development is the MP5SD series ("SD" stands for Schalldämpfer, meaning "muffled noise"), introduced in 1974. This model has an integrated soundtrack and a special barrel that slows the bullet velocity to slightly below the speed of sound. The result is that the rifle is not heard within a distance of more than 15 meters.
MP5K ("K" stands for Kurz, meaning "short"), a length of only 325 mm, was introduced in 1976, at the request of a HK rifle salesman in South Africa, who saw his potential sales for a bodyguard. The rifle has a vertical front grip to help withstand kicks, a smaller shooter, even a special bag that can be used for shooting.
In a special contract with the United States Navy, Heckler & Koch developed the MP5N ("N" for Navy, "Navy") made for elite naval units. MP5N is a standard MP5 made with naval trigger configurations, folding stocks, special barrel that can be installed silencers, and components that are more rust resistant.
The latest MP5 variant is MP5F ("F" for French, "French"), developed in 1999 for the French military. MP5F has a new internal component to receive a stronger 9 mm bullet. External changes to the MP5F are a new butt with retaining rubber, a hole for the sash to the right of the butt, and two hooks for the sash at the front.

List of variants
-MP5A1 - MP5 with pop cover, Navy / "SEF" configuration.-MP5A2 - Fixed Popor, Navy configuration / "SEF".-MP5A3 - Folded folding, Navy configuration / "SEF".
-MP5A4 - Fixed Popor, 3-item burst configuration.-MP5A5 - Folded popor, 3-point burst configuration.-MP5SFA2 - SF means single fire, auto-removed feature, fixed butt.

-MP5SFA3 - MP5SF with folding stock.-MP5N - Navy, made for the US Navy. Navy configuration, barrel for dampening, folding stock.-MP5F - French, made for the French military. Rubber with rubber holder, rope-sling hook, strong    internal components.
-MP5K - Kurz, short MP5 version, configuration "SEF".-MP5KA1 - MP5K with reduced viewfinder, "SEF" configuration.
-MP5KA4 - MP5K with 3 item burst configuration.
-MP5KA5 - MP5KA1 with 3 item burst configuration.-MP5K-N - MP5K with Navy configuration and barrel for mounted silencer.-MP5K-PDW - Personal Defense Weapon, MP5K-N with special folding stock. Introduced in 1991.
-MP5SD1 - Schalldämpfer, integrated soundproofing, A1 poplight, Navy / "SEF" configuration.-MP5SD2 - Integrated soundproofer, fixed butt; configuration Navy / "SEF".

-MP5SD3 - Integrated soundproofing, folding stock; configuration Navy / "SEF".
-MP5SD4 - MP5SD1 with 3 item burst configuration.
-MP5SD5 - MP5SD2 with 3 burst burst configuration.
-MP5SD6 - MP5SD3 with 3 burst burst configuration.
-MP5SD-N - MP5SD with Navy configuration, silencer, folding stock.
-MP5 / 10 - Using 10 mm Auto bullet. Made from 1992 to 2000.
-MP5 / 40 - Using .40 S & W bullets. Made from 1992 to 2000.