Ar Five Seven Center | AR57 ULT Upper Assembly | 5.7×28

The AR57 ULT Upper Assembly from Ar Five Seven Center is a purpose-built 5.7x28mm upper featuring a 12″ barrel and a 1:9 twist rate. The assembly is described as forged from 7075 T6 monobloc aluminum with associated bolt carrier components in 8620 steel alloy. It is intended for range use and target/competition applications where the 5.7×28 cartridge and a lightweight upper can provide low-recoil, high-velocity performance for consistent follow-up shots.

Product Specifications

• The manufacturer is Ar Five Seven Center.
• The model is AR57 ULT Upper Assembly.
• The UPC is 051497388553.
• The caliber is 5.7x28mm.
• The barrel measures 12 inches.
• The twist rate is 1:9.
• The upper is described as forged from 1 7075 T6 Monobloc Aluminum.
• The bolt carrier and related components are described as 8620 Steel Alloy.
• The product type is upper assembly for AR-pattern hosts configured for the AR57 platform.

This upper assembly offers a lightweight, precision-oriented option for shooters who favor the 5.7×28 cartridge. Its monobloc aluminum construction and 1:9 twist barrel make it suitable for serious range work and competitive target shooting where consistency and reduced felt recoil matter. The AR57 ULT is a focused component for builders and shooters assembling an AR57-configured rifle for accuracy-driven use.