A weapon system is disclose whose design permits simple reconfiguration of the weapon to perform optimally in many configurations. By reconfigurations, the weapon can be configured to fire a wide variety of cartridges, including but not limited to 7.62. times.39 mm, 5.45× 39 mm, 5.56 NATO, 0.45 ACP, 9 mm, 40 S & W, and 0.300 Magnum. This reconfiguration is accomplished by easily changing the following components: barrel; operating rod, recoil spring, and buffer; gas tube, bolt head, firing pin and extractor; and magazine well. The weapon can be reconfigured to accept a wide variety of cartridge feeding devices, including but not limited to AR15/M16 magazines, AK47 magazines, and a variety of ammunition belts and links. Also, the weapon system can be easily reconfigured to position a cartridge magazine either under the firearm or above the firearm. This is accomplished by an upper receiver design that permits the entire upper receiver to be flipped top to bottom and by use of consistent easy to connect/disconnect mounting points. In sum, this invention permits a single firearm to be simply and easily configured by the operator for a very wide range of purposes, including target shooting, hunting, military, and law enforcement. By making it possible for a user to configure the weapon for different cartridges, this weapon system permits the operator to use the ammunition most affordable, most efficient or most available for a given purpose.
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