6.8 SPC II

AR-15 6.8 SPC II 16" Rifle Builder Kit | Quad Rail, LE Stock, USA Made – Moriarti Armaments

Build your next AR-15 with the Moriarti Armaments AR-15 6.8 SPC II 16" Rifle Builder Kit. Engineered for reliability, accuracy, and versatility, this complete kit includes nearly everything needed to complete your AR-15 rifle build—excluding the 80% stripped lower receiver.

Featuring a 16-inch heavy-profile 6.8 SPC II barrel, 10-inch free-float quad rail handguard, and LE-style adjustable stock, this builder kit is an excellent choice for range shooting, hunting, and general-purpose rifle builds. The carbine-length gas system delivers dependable cycling, while the forged 7075-T6 upper receiver and Mil-Spec components provide long-lasting durability.

Designed around the 6.8 SPC II chamber, this kit requires a 6.8 SPC II bolt, which is also compatible with .224 Valkyrie bolt assemblies, making future caliber conversions simple and cost-effective.

Whether you're assembling your first AR-15 or expanding your collection, this USA-made builder kit delivers the quality, compatibility, and performance expected from Moriarti Armaments.

Features

Barrel

• Caliber: 6.8 SPC II
• Length: 16"
• Heavy Profile
• 4150 Chrome Moly Vanadium Steel
• Parkerized Finish
• Twist Rate: 1:10
• Thread Pitch: 5/8x24
• Carbine-Length Gas System
• .750" Gas Block Journal

Upper Assembly

• Forged 7075-T6 Flat Top Upper Receiver
• Hard Coat Anodized
• M4 Feed Ramps
• Forward Assist Installed
• Dust Cover Installed
• A2 Flash Hider
• Crush Washer Included

Handguard

• 10" Free-Float Quad Rail
• Aircraft-Grade Aluminum
• Mil-Std 1913 Picatinny Rails
• Hard Coat Anodized
• Lightweight and Durable Construction

Lower Build Kit

• Complete Mil-Spec Lower Parts Kit
• Mil-Spec Charging Handle
• LE-Style Adjustable Stock
• Mil-Spec Carbine Buffer Tube Assembly

Kit Includes

• Complete Upper Assembly
• 16" 6.8 SPC II Barrel
• 10" Free-Float Quad Rail Handguard
• Complete Lower Parts Kit
• LE Adjustable Stock
• Carbine Buffer Tube Assembly
• Charging Handle

Does NOT Include

• 80% Stripped Lower Receiver

Why Choose a 16" 6.8 SPC II Rifle?

The 16-inch barrel provides an excellent balance of accuracy, reliability, and versatility, making it one of the most popular configurations for the 6.8 SPC II cartridge. Combined with a carbine-length gas system and 1:10 twist, this rifle kit is well suited for recreational shooting, hunting, and all-around AR-15 performance.

An additional benefit is compatibility with 6.8 SPC II / .224 Valkyrie bolts, giving builders flexibility when planning future caliber-specific builds.

Made in USA

All major components are manufactured in the USA using Mil-Spec standards for durability, compatibility, and dependable performance.

Important Information

• Ships unassembled.
• Compatible with most Mil-Spec AR-15 lower receivers.
• This builder kit is not an FFL item because the lower receiver is not included.
• Product images may vary slightly from the final configuration.

Frequently Asked Questions

Does this builder kit include the lower receiver?

No. This kit includes all major components needed to complete your build except the 80% stripped lower receiver.

Is this a complete AR-15 builder kit?

Yes. It includes the complete upper assembly, lower parts kit, LE-style adjustable stock, buffer system, charging handle, and hardware needed to complete your rifle when paired with a compatible stripped lower receiver.

What bolt does this 6.8 SPC II kit require?

This kit requires a 6.8 SPC II bolt, which shares the same bolt face as .224 Valkyrie. A standard 5.56 NATO bolt is not compatible.

Is this kit compatible with Mil-Spec AR-15 lowers?

Yes. It is designed to fit virtually all Mil-Spec AR-15 lower receivers.

What twist rate does the barrel use?

The barrel features a 1:10 twist rate, making it suitable for a wide range of 6.8 SPC II ammunition.

Does this kit include a free-float handguard?

Yes. The kit includes a 10-inch free-float quad rail handguard with full-length Picatinny rails for mounting optics, lights, grips, and other accessories.

Is the barrel threaded?

Yes. The barrel features 5/8x24 threads, compatible with many muzzle devices designed for 6.8 SPC II rifles.

Is this builder kit made in the USA?

Yes. The major components are manufactured in the USA using Mil-Spec standards for quality, durability, and compatibility.

What stock is included?

The kit includes a Mil-Spec LE-style adjustable stock mounted on a carbine buffer tube assembly.

Who is this builder kit best suited for?

This kit is ideal for builders looking to assemble a dependable 16-inch 6.8 SPC II AR-15 rifle for recreational shooting, hunting, or general-purpose use while maintaining compatibility with 6.8 SPC II / .224 Valkyrie bolt assemblies.