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P90's are cool, compact guns, meant for use in tight situations where a rifle would simply get in the way, but a pistol wouldn't pack enough punch. Wikipedia: The P90 is a Belgian designed submachine gun. The weapon’s name is an abbreviation of Project 90, which specifies a weapon system of the 1990s. The P90 is considered a Personal Defense Weapon (PDW), and was designed as a compact but powerful firearm for vehicle drivers, operators of crew-served weapons, support personnel, special forces and anti-terrorist units. Developed between 1986–1987 at Fabrique Nationale de Herstal, the P90 features a compact bullpup design,...

On The EdgeWith the New FN P90 5.7x28mm by Al Paulson Military organizations have struggled for generations with two frequently overlapping problems: (1) how to arm troops whose primary mission is something other than the use of small arms; and (2) how to arm troops who need compact firepower for conducting special operations. A remarkable array of pistols, submachind guns and carbines have been fielded over the years in an, attempt to give people such as vehicle drivers, operators of crew-served weapons, support personnel and special operators a weapon with the optimum mix of compact size, hit probability, sustained...