The AR-57, also known as the AR Five-seven, is an upper receiver for the AR-15

AR-15

The AR-15 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed semi-automatic rifle, with a rotating-lock bolt, actuated by direct impingement gas operation. It is manufactured with the extensive use of aluminum alloys and synthetic materials....

/M16 rifle

M16 rifle

The M16 is the United States military designation for the AR-15 rifle adapted for both semi-automatic and full-automatic fire. Colt purchased the rights to the AR-15 from ArmaLite, and currently uses that designation only for semi-automatic versions of the rifle. The M16 fires the 5.56×45mm NATO...

 lower receiver, firing 5.7x28mm rounds from standard FN P90

FN P90

The FN P90 is a selective fire personal defense weapon designed and manufactured by FN Herstal in Belgium. The P90's name is taken from 1990, the year it was introduced...

 magazines. It was designed by Rhineland Arms, Inc and is currently produced by AeroPrecision, Inc of Tacoma, Washington

Tacoma, Washington

Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

, USA. The AR-57 PDW Upper is a new design on an AR15/M16 platform, blending the AR15/M16 lower with a lightweight, monolithic upper receiver system chambered in 5.7x28mm. This model is also sold as a complete rifle, supplied with four 50-round P90 magazines.

External links

• Official website