7.5" 5.56 NATO Pentagram AR-15 Upper Assembly – 7" M-LOK

7.5" 5.56 Upper: Specs & Features

The Moriarti 7.5" 5.56 NATO Pentagram Upper Assembly combines a compact AR-15 configuration with the distinctive appearance of its signature Pentagram ported steel muzzle brake.

Featuring a 7.5-inch medium-profile barrel with a black nitride finish, this upper assembly includes a 7-inch slim free-floating M-LOK handguard and a forged 7075-T6 aluminum A3 flat-top receiver.

The black nitride Pentagram muzzle brake gives this model its recognizable identity, while the coordinated black receiver, barrel, and handguard maintain a clean, consistent appearance.

Part of Moriarti's specialty upper assembly lineup, the Pentagram offers a distinctive alternative to traditional A2 flash hider and standard muzzle brake configurations.

Key Features

• 7.5" 5.56 NATO Barrel: Medium-profile, heat-treated steel with black nitride finish

• 1:7 Twist Rate: Original barrel specification

• Pentagram Ported Steel Muzzle Brake: Signature design with black nitride finish

• 1/2×28 Muzzle Threads

• 7" Slim M-LOK Handguard: Free-floating aluminum rail

• Pistol-Length Gas System

• .750" Gas Block Diameter

• M4 Feed Ramps

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

• Forward Assist and Dust Cover: Factory installed

• Black Hardcoat Anodized Receiver

Specifications

Package Includes

• One assembled A3 flat-top upper receiver

• Installed forward assist and dust cover

• One 7.5" 5.56 NATO medium-profile barrel

• One 7" slim free-floating M-LOK handguard

• Installed pistol-length gas system components

• One black nitride Pentagram ported steel muzzle brake

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

Frequently Asked Questions

What distinguishes the Moriarti Pentagram upper assembly?

The Pentagram model features a distinctive black nitride ported steel muzzle brake, combined with a compact 7.5-inch barrel and slim M-LOK handguard.

What barrel does this upper feature?

The upper features a 7.5-inch medium-profile 5.56 NATO barrel with a black nitride finish, M4 feed ramps, and 1:7 twist.

What handguard is included?

This model includes a 7-inch slim free-floating M-LOK handguard.

What gas system does the Pentagram upper use?

The assembly features a pistol-length gas system.

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

No. The bolt carrier group and charging handle are available separately.

Is a lower receiver included?

No. This product is an upper assembly only.

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