The AR-57, also known as the AR Five Seven , is a Lower receiver for the AR-15/M16 rifle and an Upper receiver, firing 5.7×28mm rounds from standard FN P90 magazines. It was designed by AR57 LLC[3] and is currently produced by AR57 of Kent, Washington, USA. 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.[1] 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.

The AR-57
TypeSemi-automatic carbine Personal defense weapon
Place of originUnited States
Production history
ManufacturerAR57 LLC
Unit costUS$1,099
Mass7.45 lb (3.4 kg) (AR-57 PDW)[1]
Length30 in (762.0 mm) (AR-57 PDW)[1]
Barrel length16 in (406.4 mm) (AR-57 PDW)[1]

CartridgeFN 5.7×28mm[2]
Feed systemFN P90 detachable box magazines[2]
SightsM1913 Picatinny rail[2]

Unlike the standard AR-15 configuration which uses a gas-tube system, the AR-57 cycles via straight blowback.[4] A full auto version exists marketed as a competitor to the P90 and other personal defense weapons.[5]


See also

  • AR-15 variants


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