This Aim Sports Complete Upper Assembly (brand part no. AR5CUB8) pairs a mil-spec forged 7075-T6 upper receiver with a 10.5-inch, 5.56x45mm NATO barrel and a 10-inch M-LOK handguard. The receiver gets a Type III hard-coat anodized finish for durability, while the 4150 CMV steel barrel and 9310 tool steel bolt both wear a nitride finish for lubricity and corrosion resistance. A full-auto-profile barrel contour adds extra wall thickness for rigidity, and the upper ships fully assembled with an M4 feed ramp extension, a charging handle, and no sights installed for a clean, optic-ready build.

Key Specifications

• Chambered in 5.56x45mm NATO.
• Barrel measures 10.5 inches.
• Rifled with a 1:8-inch twist rate.
• Mil-spec forged 7075-T6 upper receiver.
• Type III hard-coat anodized finish for durability.
• Barrel is 4150 CMV steel with a nitride finish for lubricity and corrosion resistance.
• Bolt is 9310 tool steel, also nitride finished to match the barrel.
• Full-auto-profile barrel contour for extra wall thickness and rigidity.
• Fitted with a 10-inch M-LOK handguard.
• Ships fully assembled with a charging handle included.
• No sights installed, optic-ready.

Frequently Asked Questions

Does this include a charging handle? Yes, a charging handle is included with the assembly.

Does this upper come with sights? No, it ships without sights, ready for an optic.

What does full-auto-profile mean here? It refers to the barrel’s wall thickness and contour, not the rifle’s firing mode.

Buy the Aim Sports 5.56 10.5-inch Complete Upper

A forged receiver, a nitride-finished barrel and bolt, and an M-LOK handguard already assembled make this a straightforward drop-on upper for a short-barrel AR-15 build. Browse more AR15 uppers from Aim Sports and order it from our Lubbock, Texas gun shop as soon as it’s ready to ship.