Aim Sports AR5CUB8 Assembly — 5.56 NATO, 10.50″ Barrel

This Aim Sports AR5CUB8 is a fully assembled AR-15 upper built on a mil-spec forged 7075-T6 receiver with a Type III hard coat anodized finish. It ships with a 10.50" 4150 CMV steel barrel finished in black nitride and a matching bolt made from 9310 tool steel. The unit includes a charging handle and a 10" M-LOK handguard and is configured for optic use with no iron sights installed.

Key Specifications

• The caliber is .223 REM/5.56 NATO.
• This assembly is a Complete upper.
• The barrel has a 1:8" rate of twist.
• Sights are None, Optic Ready.
• The handguard is a 10" M-LOK configuration.
• The barrel is made from 4150 Chrome Moly Vanadium Steel.
• The barrel length is 10.50".
• The barrel finish is Black Nitride.
• The receiver is forged from 7075-T6 Aluminum.
• The bolt is made from 9310 tool steel.

Built to provide a compact, serviceable upper for short-barrel AR-15 configurations, this assembly balances durable materials with practical features for close-quarters and general-purpose use. The combination of a nitride-treated 4150 CMV barrel and a Type III hard coat anodized 7075-T6 receiver emphasizes corrosion resistance and service life while leaving sighting choices open for the operator. Its components and finish make it a straightforward option for those assembling a compact AR that requires a complete upper with proven materials and standard AR interfaces.