The AR57 ULT Upper Assembly with a 12-inch barrel in 5.7x28mm (brand part no. ULT12) is the Ultra Light Tactical upper for the AR57 platform from AR57. It pairs a 12-inch barrel with a 1:9 twist and a black Melonite finish with a forged 7075 T6 monobloc aluminum upper and 8620 steel alloy bolt carrier components. The assembly is built to be lightweight and durable for a compact 5.7x28mm build, and it includes a Melonite-treated flash hider.

Key Specifications

• The barrel is 12 inches long, a compact length for a handy 5.7x28mm build.
• The chambering is 5.7x28mm, the cartridge this AR57 upper is built for.
• The twist rate is 1:9, as listed for this 12-inch barrel.
• The upper is a forged 7075 T6 monobloc aluminum unit, lightweight and rigid.
• The bolt carrier components are 8620 steel alloy for strength and durability.
• The finish is black Melonite, which improves wear and corrosion resistance.
• The assembly includes a Melonite-treated flash hider on the muzzle.

Frequently Asked Questions

What twist rate does the 12-inch ULT upper have? The 12-inch barrel has a 1:9 twist rate.

What is the upper made from? It is a forged 7075 T6 monobloc aluminum upper with 8620 steel alloy bolt carrier components.

What finish does it have? The barrel and components have a black Melonite finish.

Buy the AR57 ULT Upper Assembly, 12-Inch Barrel, 5.7x28mm

The 12-inch ULT is the shorter option in the AR57 Ultra Light Tactical lineup, with the same forged receiver and Melonite finish as its longer sibling. Order it from our Lubbock, Texas gun shop for fast shipping, and see more AR-15 uppers while you are here.