Moriarti AR-15 5.56/.223 16" Tactical Rifle Kit – M4 Classic with Quadrail, 1:7 Twist

5.56 Rifle Kit: Specs & What's Included

The AR-15 5.56/.223 16" M4 Classic Tactical Rifle Build Kit is the perfect solution for enthusiasts looking to build their own AR-15 rifle. Constructed with high-quality components that meet Mil-Spec standards, this kit offers everything you need for a functional, durable rifle, excluding the 80% lower receiver. Whether you're a first-time builder or an experienced marksman, this complete kit ensures reliable performance and longevity.

Key Features:

• 16” Barrel: Constructed from 4150 CMV steel, this barrel is chambered for 5.56 NATO and features a 1:7 twist rate for reliable stabilization of a wide range of bullet weights. The barrel has been phosphate processed for corrosion resistance and is optimized for carbine-length gas systems.

• Quadrail Free Float Handguard: The 10" quadrail handguard is made from aircraft-grade aluminum, ensuring both strength and lightweight performance. It is hardcoat anodized for durability and features a free-floating design for improved accuracy.

• M4 Flat Top Upper Receiver: Made from 7075-T6 aluminum, this upper is machined to Mil-Spec and hardcoat anodized for extra durability. The flat top design provides an ideal mounting platform for optics and accessories.

• A2-style Flash Hider: Installed and secured with a crush washer, this flash hider reduces muzzle flash for better concealment during low-light shooting.

• M16 Bolt Carrier Group: Made from 8620 steel with a 9310 steel bolt, this chrome-lined BCG ensures smooth cycling and extended service life. The magnetic particle inspection (MPI) process guarantees the integrity and performance of the components.

• Carbine Gas System: Designed for reliable operation, the carbine-length gas system ensures smooth cycling and increased reliability.

• Classic AR-15 Lower Parts Kit: This Mil-Spec parts kit includes all the necessary components to complete the lower receiver, including a trigger group, grip, and selector switch. Compatible with your 80% lower (not included), this kit is essential for finishing your build.

• M4 6-Position Stock Assembly: This adjustable stock assembly provides versatility, allowing you to customize your rifle’s length of pull. It comes with a Mil-Spec buffer tube and buffer spring for reliable function.

Specifications:

• Barrel Length: 16"
• Barrel Material: 4150 CMV Steel
• Barrel Finish: Phosphate Processed
• Chamber: 5.56 NATO
• Twist Rate: 1 in 7"
• Gas System: Carbine Length
• Muzzle Thread: 1/2x28
• Muzzle Device: A2-style Flash Hider
• Gas Block Diameter: .750"
• Upper Receiver: M4 Flat Top, 7075-T6 Aluminum
• Handguard: 10" Quadrail Free Float, Aircraft Grade Aluminum, Hardcoat Anodized
• Bolt Carrier Group: M16 BCG, 8620 Steel, Chrome Lined, 9310 Steel Bolt (MPI Tested)
• Lower Parts Kit: Classic AR-15 Mil-Spec Lower Parts Kit
• Stock: M4 6-Position Mil-Spec Stock Assembly with Buffer Tube
• Compatibility: DPMS-style Lower (80% receiver required)
• Change the look with our Moriarti Tactical Charging Handle Assembly

Please Note:

• Unassembled Kit: This is a build kit and does not come assembled. The 80% lower receiver is not included and must be finished with machining.
• Barrel Twist: Depending on stock availability, the barrel may come with a 1:7 or 1:8 twist.
• Images: Images may not represent the exact product, as components and finishes may vary slightly.
• Non-FFL Item: Since this kit is unassembled, no FFL is required to purchase it. However, machining is required for the 80% lower receiver.

FAQ

Is a lower receiver included?

No. The lower receiver is sold separately; you finish the build on your own AR-15 lower.

What bolt and magazines does it use?

A standard 5.56 AR-15 bolt carrier group and standard AR-15 / STANAG magazines.

Related: 5.56 NATO build kits · all AR-15 build kits