Key advantages of the MP7 include extremely compact size, high rate of fire, and armor piercing cababilities. Major disadvantages, which make this weapon unsuitable as a primary weapon include lack of stopping power and range.
The Heckler & Koch MP7 was designed in conjunction with the new cartridge to meet NATO requirements published in 1989 calling for a personal defense weapon (PDW) class firearm with a greater ability to defeat body armor than current weapons, which are limited due to the use of conventional pistol cartridges. The MP7 went into production in 2001. It is a direct rival to the FN P90, also developed in response to NATO's requirement. The weapon has been revised since its introduction and the current production version is the MP7A1. It acts as a scaled down assault rifle using the same action as H&K's highly popular G36. It's newly designed 4.6x30mm cartridge is specially designed and armor-piercing with a muzzle velocity nearly as high as that of the 5.56 x 45 mm NATO cartridge used by many modern rifles including the M16 and SA80.