AR57 5.7x28mm Complete 12″ AR Pistol Upper Receiver

Elevate your firearm performance with the impeccable engineering of this 5.7x28mm Complete Upper. This cutting-edge AR57 Upper seamlessly integrates into any standard lower, ensuring you experience smooth, hassle-free installation and use. Delving into the specifics, the unit boasts a robust Kryptonite Monobloc construction, derived from a single block of Aircraft Grade 7075 T6 aluminum, rated at a remarkable 83000 PSI strength. The precision milling guarantees accuracy to within .002 tolerance. The barrel, spanning 12 inches, concludes with a perforated muzzle brake attached via 1/2 x 28 threads, culminating in an overall length of 18 inches making this a suitable complete upper receiver for your AR Pistol. 

• 5.7x28mm Complete Upper 12″ – AR57
• Aircraft Grade 7075 T6 aluminum
• Melanite-treated metal components
• Chambered in 5.7 x 28 mm

Further enhancing its versatility, the upper incorporates a 13-slot Picatinny rail, augmented by 3-slot upper and lower forward rails. Durability remains paramount, with all key metal parts undergoing melanite treatment. Eliminate the concerns of a gas system clogging, as this design champions a chamber that resists carbon and fouling accumulation, even through prolonged shooting sessions. Celebrate the genius of simplicity with its free sliding bolt – the sole moving component, and revel in effortless maintenance. Lastly, the AR-57 system’s unique design ensures that spent rounds are ejected through the lower’s magazine well. Order your new AR-15 5.7x28mm upper receiver online today!

Need some ammo to go along with your new upper? Click here to check out our 5.7×28 ammo!

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Caution : Must install buffer before use