Aero Precision Ar15 Complete - Upper 16" Carbine 5.56/223

The Aero Precision AR15 Complete Upper is a ready-to-assemble upper receiver assembly built around a 16" 5.56 NATO barrel, designed for shooters who want a combat-proven carbine platform without starting from bare parts. With a pinned front sight base, M4-style handguard, and carbine-length gas system, this upper delivers the balance of velocity, handling, and compatibility that makes 16-inch AR15s the most popular rifle length for hunters, sport shooters, and defensive-minded builders alike. Aero Precision has earned its reputation for tight tolerances and consistent quality across their receiver components, and this complete upper maintains that standard with mil-spec dimensions and a durable black nitride barrel finish.

Because this is a complete upper—not just a stripped receiver—you're getting a functional assembly that includes the barrel, handguard, front sight, and gas tube already installed and headspaced. That means less assembly work and fewer variables when you marry it to a lower receiver. The 16" carbine configuration is the sweet spot for most AR builds: short enough to handle in tight spaces and from a vehicle, yet long enough to give you solid velocity from 5.56 ammunition. Whether you're running this as part of a hunting rifle, a range gun, or a home-defense setup, the carbine length is proven in the field.

One important note: this upper does not include a bolt carrier group or charging handle, so you'll need to source those separately. The standard A2 flash hider comes installed, which is suitable for most shooting applications, though many builders swap it for a different muzzle device down the road. At just under 70 ounces (without BCG and charging handle), the upper is lightweight enough to keep your finished rifle nimble without sacrificing the rigidity you need for accuracy.

Key Features

• 16" 5.56 NATO barrel with pinned front sight base for a classic, field-proven setup
• M4-style handguard provides ergonomic rail space for lights, optics, and accessories
• Carbine-length gas system balances velocity and recoil impulse across standard 5.56 loads
• Mil-spec upper receiver compatible with any standard AR15 lower
• Black nitride barrel finish resists corrosion and wear
• Factory-installed and headspaced—ready to pair with your lower and fire

Specifications

Frequently Asked Questions

What lower receiver does this upper fit?

This is a mil-spec AR15 upper, so it will fit any standard mil-spec AR15 lower receiver. It's fully compatible with commercial and milspec lowers and will work with both full-auto and semi-auto lower configurations (though the function depends on your lower's configuration).

What do I need to add to complete this upper?

This complete upper does not include a bolt carrier group (BCG) or charging handle, so you'll need to source those separately. Once you have a BCG and charging handle installed in the upper, you can pair it with a complete lower receiver to build a functional rifle.

Is the barrel pinned or does it have a crush washer?

The front sight base is pinned to the barrel, which is the classic, field-proven approach used by Aero Precision on this assembly.

Can I use this for hunting or long-range shooting?

The 16" carbine configuration is practical for hunting and sport shooting at typical hunting ranges. The 5.56 NATO cartridge is suitable for varmint and small-game hunting, and the carbine length gas system keeps recoil manageable. For dedicated long-range precision work, shooters often prefer longer barrels and different handguard setups, but this upper will certainly function at distance—performance depends on your ammunition, optic, lower receiver, and shooter skill.