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!

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*Caution : Must install buffer before use