AR-57

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Abstract is: The AR-57, also known as the AR Five Seven, is available as either an upper receiver for the AR-15/M16 rifle or a complete rifle, firing 5.7×28mm rounds from standard FN P90 magazines. It was designed by AR57 LLC was produced by AR57 of Kent, Washington, United States. The company is now defunct. The AR-57 PDW upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in FN 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. The magazines mount horizontally on top of the front handguard, with brass ejecting through the magazine well. Hollow AR-15 magazines can be used to catch spent casings. Unlike the standard AR-15 configuration which uses a gas-tube system , the AR-57 cycles via straight blowback. A full auto version exists and was marketed as a competitor to the P90 and other personal defense weapons.

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AR-57 is …