AR-15 5.56/.223 16" M4 Upper with Red M-LOK Handguard & Custom Pineapple Muzzle Brake

16" 5.56 Upper: Specs & Features

Make a statement at the range with the AR-15 5.56/.223 16" M4 Red Upper Assembly with Custom Pineapple Brake, engineered by Moriarti Armaments for both style and precision.

This upper is chambered in 5.56 NATO / .223 Wylde, offering optimal compatibility and accuracy. The 16" M4 contour barrel is crafted from durable 4150V chrome moly steel, button-rifled with a 1:7 twist, and designed for reliability under high heat and stress.

The custom Pineapple muzzle brake, made from 4150 steel with phosphate coating, not only adds aggressive styling but also aids in recoil reduction and muzzle control.

The upper’s rifle-length red MLOK handguard is free-floating and precision machined from 7075-T6 aluminum, giving you both strength and a bold look. The A3 flat-top upper receiver, forged from 7075-T6 aluminum and red hardcoat anodized, includes a forward assist and dust cover.

Key Features:

• Caliber: 5.56 NATO / .223 Wylde

• Barrel Length: 16" M4 Contour

• Twist Rate: 1:7 Button Rifled

• Barrel Material: 4150V Chrome Moly Steel, Heat Treated

• Thread Pitch: 1/2x28

• Muzzle Device: Custom 4150 Steel Pineapple Muzzle Brake (Phosphate Coated)

• Gas System: Carbine Length

• Gas Block Diameter: .750 Low Profile

• Handguard: Red Rifle-Length MLOK Free Float, 7075-T6 Lightweight Aluminum

• Upper Receiver: A3 Flat Top, 7075-T6 Forged Aluminum, Red Hardcoat Anodized

• Includes: Forward Assist, Dust Cover

• Excludes: BCG and Charging Handle (Available Separately)

Forge mark may vary due to sourcing across multiple certified U.S. forging partners to maintain supply.

Need a full build? Check out the matching Moriarti AR-15 Lower Receiver.

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.

What twist rate does it use?

A 1:7 twist, the mil-spec rate that stabilizes 55 gr through heavy 77 gr loads.

Is a bolt carrier group included?

No. The upper ships without a BCG; add a standard 5.56 / .223 AR-15 bolt carrier group.

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

Images may not be an exact representation of the product.