The AR57 Ultra Light Tactical (ULT) upper assembly (AR57 part no. ULT16) is a complete 16-inch-barrel upper chambered in 5.7x28mm, forged from a one-piece 7075-T6 monobloc aluminum receiver with a black Melonite finish.

Key Specifications

• Chambered in 5.7x28mm.
• Barrel length of 16 inches.
• 1:9 twist rate.
• Forged from one-piece 7075-T6 monobloc aluminum.
• Finished in black Melonite.
• 8620 steel alloy bolt carrier, buffer tube, and flash hider, also Melonite treated.

Frequently Asked Questions

What twist rate does this barrel use? A 1:9 twist rate, matched to 5.7x28mm ammunition.

What finish does this upper have? Black Melonite, with the 8620 steel alloy bolt carrier, buffer tube, and flash hider also Melonite treated.

What’s the receiver made from? A one-piece 7075-T6 monobloc aluminum forging with an 8620 steel alloy bolt carrier.

Buy the AR57 ULT Upper Assembly, 16in

Order this upper assembly from our Ar Five Seven Center lineup, browsable in our full AR15 uppers selection, with fast, insured shipping from our Lubbock, Texas gun shop.