The AR-57, also known as the AR Five-seven, is an upper receiver for the AR-15/M16 rifle lower receiver, firing 5.7x28mm rounds from standard FN P90 magazines. It was designed by Rhineland Arms, Inc and is currently produced by AeroPrecision, Inc of Tacoma, Washington, 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.
The 5.7x28mm cartridge is a small caliber, high velocity cartridge created by FN Herstal in Belgium, in conjunction with the FN P90 personal defense weapon (PDW) and FN Five-seven pistol and in response to NATO requests for a replacement for the 9x19mm Parabellum cartridge.
AR57 - Official Manufacture's website.
AR57 Instruction video
Important Notice.
What featured on the page of this blog is a form of recommendations intended to inspire ideas for recycling Colt M16A1 and M16A1 Carbine stored in the inventory of the Royal Malaysian Armed Forces. No detailed studies have been done by me and the information I contribute is not suitable as main reference for the upgrade program. However, I believe by sharing this information will assist the parties’ concerned to find an appropriate way to use the resources which is already available.
