12.5" 5.56 NATO AR-15 Suppressor Ready Upper – 10" Diamond Cut M-LOK, Cerakote Color Choice

12.5" 5.56 Upper: Specs & Features

The Moriarti 12.5" 5.56 NATO Suppressor Ready Upper Assembly features a 12.5-inch nitride barrel, 10-inch Diamond Cut M-LOK handguard, and exposed threaded muzzle.

Part of Moriarti's Suppressor Ready Series, this configuration features a forged 7075-T6 aluminum A3 upper receiver and a free-floating Diamond Cut handguard with geometric openings and a continuous top Picatinny rail.

The 12.5-inch 4150 chrome moly vanadium barrel features a QPQ/nitride finish, 1:7 right-hand twist, and carbine-length gas system with a .750 low-profile steel gas block.

Available in five matching Cerakote finishes: Black, Titanium Blue, Flat Dark Earth (FDE), Sniper Grey, and OD Green. The upper receiver and handguard feature the same selected color.

The barrel is supplied without a flash hider, muzzle brake, or suppressor.

Key Features

• 12.5" 5.56 NATO Barrel: 4150 CrMoV steel with QPQ/nitride finish

• 1:7 RH Twist: Right-hand rifling

• Carbine-Length Gas System: .750 low-profile steel gas block

• 10" Moriarti Diamond Cut Handguard: Geometric cutout design

• Free-Floating M-LOK Rail: Continuous top Picatinny rail

• Exposed Threaded Muzzle: No muzzle device included

• Matching Cerakote Finish: Upper receiver and handguard finished in the selected color

• Five Color Choices: Black, Titanium Blue, FDE, Sniper Grey, OD Green

• Forged 7075-T6 Upper Receiver: A3 flat-top configuration

• Forward Assist and Dust Cover: Installed

• M4 Feed Ramps: Included

• Suppressor Ready Series: 12.5-inch Diamond Cut configuration

Specifications

Package Includes

• One 12.5" 5.56 NATO AR-15 upper assembly

• Forged A3 flat-top upper receiver in selected Cerakote finish

• Installed forward assist and dust cover

• 12.5" 4150 CrMoV QPQ/nitride barrel

• 10" Moriarti Diamond Cut M-LOK handguard in matching Cerakote finish

• Installed carbine-length gas system and .750 low-profile steel gas block

Not Included: Bolt carrier group, charging handle, muzzle device, suppressor, lower receiver, or magazine.

Frequently Asked Questions

What distinguishes the 12.5" Diamond Cut Suppressor Ready upper?

This configuration features a 12.5-inch barrel, 10-inch Diamond Cut M-LOK handguard, and exposed threaded muzzle without an installed muzzle device.

How does this differ from the 8.5" Diamond Cut version?

The 12.5" model features a longer barrel, 10" handguard, and carbine-length gas system. The 8.5" configuration uses a 7" handguard and pistol-length gas system.

Does this upper include a suppressor or muzzle device?

No. The barrel is supplied with an exposed threaded muzzle. No suppressor, flash hider, or muzzle brake is included.

Which Cerakote colors are available?

Black, Titanium Blue, Flat Dark Earth (FDE), Sniper Grey, and OD Green.

Do the upper receiver and handguard match?

Yes. Both components receive the selected Cerakote finish.

Does this upper include a bolt carrier group or charging handle?

No. Neither component is included.

Will every suppressor fit this upper?

No. Compatibility depends on the suppressor, mounting system, barrel threads, and manufacturer requirements. Compatibility must be verified for the intended equipment.

Product Image Notice

Images may not be the 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.

Can I shoot both 5.56 NATO and .223 Remington?

Yes. A 5.56 NATO or .223 Wylde chamber safely fires both 5.56 NATO and .223 Remington ammunition.

Is a bolt carrier group included?

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

What twist rate does it use?

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

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