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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 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. 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 marketed as a competitor to the P90 and other personal defense weapons.
I have a GWOT /Clone mash/ build in my head that will require a super chunky AR rail. An Arms #59 or Vltor CASV would be ideal, but others considered… just need it to be obnoxiously phat robust and heavy for what I have in mind. I plan on chopping it a bit to accommodate an early PWS long...
I have two SLR rails for sale.
The first is an older 14” SOLO Keymod—this uses a slightly shorter barrel nut, and the tensioning system is two Allen bolts threading into helicoiled tabs through a proprietary washer. It’s Q-mod, so all the Keymod holes are QD points. Additionally, the end of the...