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|quotetext=An odd-looking weapon with equally odd traits, the P90 is classified as a submachine gun, but it defies even that definition. The caliber it was designed for, 5.7x28mm, is more like a miniature rifle caliber, and we even classify it as such. In an attempt to better define what the P90 is, it is sometimes given the moniker of '''P'''ersonal '''D'''efense '''W'''eapon, of which it was the first of its kind. The intention behind this weapon (and PDWs in general) was to provide a lightweight, compact, stable platform with a better performance against armor than [[H&K MP5A3|a traditional pistol-caliber SMG]]. To achieve this effect to the greatest possible degree, it was designed with a 50-round magazine, and it is recommended to feed it with armor-piercing ammunition. Fully ambidextrous, downwards case ejection , and extensive use of polymers in its construction, the P90 aims to be as convenient, user friendly, and lightweight as possible. Skilled P90 operators swear by it, and [[MP7]] operators endlessly debate them over which one of the two is the better weapon.