AR57 16" Complete SLC M-LOK Upper receiver 5.7x28 w/1-50 rnd mag

AR57 16" Complete SLC M-LOK Upper. AR57 Mfg., Factory new. Comes with 16" Lightweight barrel, Lightweight flash hider, Semi-auto bolt, Carbine buffer, Ambidextrous mag release and Charging handle with M-LOK rails.

Convert your AR-15 type rifle into something as good as an FN P-90 rifle for about 1/3 of the usual cost!

This AR57 Upper is constructed with a steel barrel, brake, bolt, buffer, and screws, built into an alloy housing. A single block of Aircraft Grade 7075 T6 aluminum, rated at 83000 PSI strength is used for the receiver and its component rails. Precision milled to within .002 tolerance, this upper is chambered in 5.7 x 28 mm. The barrel is 16 inches with a perforated brake attached on 1/2 x 28 threads making the overall length 18 inches; the bore is six groove right hand 1:8.5 FN twist. The sight system is a 13 slot Picatinny over the operating handle, with 3-slot upper and lower forward rails. The final steps include Infused Hard Coat Anodized finish on the alloy, and Parkerization on steel surfaces, installation of front and rear sight area Picatinny rails. GBQ Parkerizing process ensures finish durability on the steel. Bolt is heat treated 4140 chrome alloy which is parkerized like the barrel. The receiver and rail block measures just over 17 inches overall length; from the receiver back to the muzzle end, the total length is 24 9/16 inches. This upper receiver comes equipped with a 3 5/8 inch Carbine buffer; owners with A2 rifles will need an AR type buffer. In contrast to many other receivers, there is no gas system to become clogged with carbon or fouling; the chamber stays clean well beyond extended shooting. Extremely reliable, simplicity is key, with the free sliding bolt being the only moving element and its easy removal makes maintenance literally a snap. The AR-57 system ejects spent rounds through the lower’s magazine well.

This upper comes with one 50 round magazine. 

Manufactured and warrantied by AR57 LLC of Kent, WA. 

Note: Intended and warrantied for use with FNH and AR57 magazines only.  Other aftermarket magazines such as "ATI" or "KCI" have proven to fail and do not meet the same standards, quality or specs.

Warning: Using damaged, incorrect, non-standard or hand loaded ammunition may result in firearm failure or misfire.  USE ONLY SAAMI or C.I.P. APPROVED AMMUNITION!  Manufacturer can assume no liability nor warrant our products for incidents which occur through the use of cartridges of nonstandard dimensions or which develop pressures in excess of commercially available ammunition which has been loaded in accordance with standards established by the Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) or Commission Internationale Permanente (C.I.P.)