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Home > Parts > AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

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AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

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From $649.98

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Manufacturer Ar57
Manufacturer Code 5FC-UFH-AR57-AR57-ULT16
EAN/UPC Code 051497297985

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6969 Gadsden Hwy,
Trussville - AL,
United States - 35173
(205) 649-1664‬

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38 W 20TH ST,
Paris - Kentucky,
United States - 40361
502-272-4859

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411 Cedar Road,
Mason - MI,
United States - 48854
517-244-9001

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Details of AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard. Comes with a 16in lightweight barrel with M-LOK rails. This AR57 Upper Receiver Assembly converts any AR-15 lower to a rifle capable of shooting 5.7x28 ammunition. The unique upper design loads from the top and ejects downward through the AR-15 mag well. The new generation upper has a stronger lighter and more streamlined rail; finished with a beautiful ultra-smooth melonite black coating. Convert your AR-15 type rifle to shoot the same 5.7x28 ammo as the legendary FN P-90 PDW This AR57 Upper is constructed with a steel barrel muzzle brake bolt carrier group buffer and screws all built into an alloy monobloc receiver. In other words it is ready to drop in and push pin. It is also built as solid as a tank. A single block of Aircraft Grade 7075 T6 aluminum referred to as Kryptonite Monobloc and 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 muzzle 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 metal parts including receiver rail barrel and bolt are melanite treated for a hard durable finish. Bolt is made from 8620 alloy. 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. 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 lowers magazine well. This upper comes with ultra-lightweight barrel and muzzle brake proprietary carbine buffer ambidextrous mag release reversible charging handle and M-LOK handguard. 50 Round Magazine is NOT Included. Specifications for AR57 ULT Assembly 5.7 x 28mm Upper Receiver without Magazine: Manufacturer: AR57 Cartridge: 5.7x28mm Threads per Inch: 1/2x28 Fabric/Material: 8620 Alloy Gun Rail: M-LOK Gun Type: Shotgun Package Contents: AR57 AR57 ULT Assembly 5.7 x 28mm Upper Receiver without magazine AR57 AR57-ULT16: Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard AR57 AR57-ULT16: Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

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AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

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Details of AR57 Upper Receiver AR57 ULT Assembly 5.7 x 28mm 16in 1-8.5 FN Twist 1/2x28 Thread M-LOK Handguard

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