AR-15 5.56/.223 18" Stainless Steel Spiral Fluted Upper Assembly, M-LOK Rail

18" 5.56 Upper: Specs & Features

The AR-15 5.56/.223 18" Stainless Steel Spiral Fluted Upper Assembly with Mlok rail offers precision and durability for your AR-15 build. This upper assembly is chambered in .223 Wylde, allowing you to fire both 5.56 NATO and .223 Rem rounds. With an 18" spiral-fluted stainless steel barrel, the assembly provides reduced weight, improved rigidity, and superior heat dissipation for consistent performance during rapid fire. The M-Lok handguard offers a versatile mounting platform for accessories like lights, grips, and optics. Whether you’re upgrading an existing build or assembling your dream rifle, this upper assembly is a key component for accuracy and reliability.

Key Features:

• Caliber: Compatible with 5.56 NATO and .223 Rem rounds, chambered in .223 Wylde.
• Barrel: 18" 416 stainless steel, spiral-fluted for reduced weight, improved rigidity, and heat dissipation.
• Muzzle Device: Includes a nitride triport muzzle brake with a 1/2x28 thread and crush washer.
• Gas System: Mid-length gas system with a .750 low profile gas block for smoother operation and reduced recoil.
• Handguard: A 12" M-Lok free-floating rail for enhanced mounting options and flexibility.
• Material: Constructed from 7075-T6 aluminum with a black hardcoat anodized finish for added durability and corrosion resistance.
• Receiver: A3 flat top upper receiver with M4 feed ramps for easy compatibility with other AR-15 components.

Note: BCG and Charging Handle are not included, available separately. Images may not be an exact representation of the product.

FAQ

Will this upper fit my AR-15 lower?

Yes. It fits any standard mil-spec AR-15 lower receiver and uses a standard 5.56 bolt carrier group and STANAG/AR-15 magazines.

What is a .223 Wylde chamber?

A hybrid chamber that safely fires both 5.56 NATO and .223 Remington while giving the tighter accuracy of a .223-style throat.

Is a bolt carrier group included?

No. The bolt carrier group is sold separately; any standard 5.56 AR-15 BCG will work.

Related: 5.56 NATO & .223 Wylde AR-15 uppers