300 BLK Pistol Length

5" 300 Blackout Upper Assembly – AR-15 Pistol Upper with American Flag Engraving & Shark Muzzle Brake | Moriarti Armaments

Upgrade your AR-15 platform with the Moriarti 5 Inch 300 Blackout Upper Assembly, designed for shooters looking for a compact, reliable, and highly customizable .300 AAC Blackout configuration. Featuring a precision-machined billet upper receiver, 5-inch nitride-treated barrel, Shark Muzzle Brake, and distinctive American Flag engravings, this upper delivers a unique combination of performance, durability, and style.

Built to work with standard AR-15 lower receivers and compatible with common AR-15/M16 pattern bolt carrier groups, this 5 Inch 300 Blackout Upper provides an easy way to create a compact .300 BLK pistol build without major modifications.

The .300 AAC Blackout cartridge is known for its versatility, offering excellent performance with both supersonic and subsonic ammunition while maintaining compatibility with the familiar AR-15 platform.

Key Features at a Glance

Caliber: .300 AAC Blackout
Platform: AR-15
Barrel Length: 5"
Barrel Material: 4150 Chrome Moly Vanadium (CMV)
Barrel Finish: Black Nitride
Twist Rate: 1:7 Button Rifled
Gas System: Micro/Pistol Length Gas System
Upper Receiver: Billet Aluminum Upper Receiver
Muzzle Device: Shark Muzzle Brake
Muzzle Thread: 5/8x24
Gas Block: .750 Low Profile Steel Gas Block
Charging Handle: American Flag Engraved
Dust Cover: American Flag Engraved
BCG: Not Included
Best For: AR-15 Pistol Builds, Compact Builds, Range Shooting, Custom AR Builds

Features

.300 AAC Blackout Performance

The .300 AAC Blackout cartridge was designed to maximize performance in the AR-15 platform, especially in shorter barrel configurations. This caliber provides excellent versatility with both supersonic and subsonic ammunition options, making it a popular choice for compact AR-15 builds.

5" Nitride Treated Barrel

The 5-inch 4150 CMV barrel provides a durable and corrosion-resistant foundation for your build. The 1:7 twist rate is designed to stabilize a wide variety of .300 Blackout projectile weights, providing reliable accuracy for recreational and range applications.

Shark Muzzle Brake

Equipped with the Moriarti Shark Muzzle Brake, this upper features a 5/8x24 threaded muzzle device designed to help reduce muzzle movement and improve control during shooting.

The aggressive Shark design adds a distinctive appearance while providing functional performance benefits.

American Flag Engraved Components

This upper features unique patriotic detailing, including:

• American Flag engraved charging handle
• American Flag engraved dust cover

These custom details give the upper a distinctive appearance while maintaining dependable AR-15 functionality.

Billet Upper Receiver

The precision-machined billet aluminum upper receiver provides a strong and lightweight platform for your .300 Blackout build.

Designed for compatibility with standard AR-15 components, this receiver offers a solid foundation for a custom pistol configuration.

Perfect For

The Moriarti 5 Inch 300 Blackout Upper is ideal for:

• AR-15 pistol builds
• Compact .300 Blackout configurations
• Custom AR-15 projects
• Recreational shooting
• Range use
• Shooters looking for a unique American Flag engraved upper
• Builders wanting a short, maneuverable AR platform

Build Your 300 Blackout AR15

Complete your build with:

• AR-15 Lower Receiver
• AR-15 Bolt Carrier Group
• AR-15 Charging Handle
• AR-15 Magazines
• AR-15 Optics
• AR-15 Ammo

Frequently Asked Questions

Will this 5 Inch 300 Blackout Upper fit my AR-15 lower?

Yes. This upper assembly is designed to fit most standard AR-15 lower receivers.

Does this upper include a bolt carrier group?

No. The BCG is not included. This upper is designed to work with a standard AR-15/M16 pattern bolt carrier group.

Can I use standard AR-15 magazines with 300 Blackout?

Yes. .300 AAC Blackout is designed to function with standard AR-15 magazines. Many shooters choose to dedicate magazines to specific calibers to prevent ammunition mix-ups.

Can this upper shoot subsonic and supersonic ammunition?

Yes. The .300 AAC Blackout cartridge was developed to support both subsonic and supersonic loads. Performance will depend on ammunition selection and overall firearm configuration.

Is this 300 Blackout upper suppressor compatible?

The 5/8x24 threaded muzzle accepts compatible muzzle devices and suppressors where legally permitted.

Why choose a 5 inch 300 Blackout upper?

A 5 inch 300 Blackout upper provides an extremely compact AR-15 configuration while taking advantage of the cartridge's excellent short-barrel performance. It is a popular choice for shooters who want a lightweight, maneuverable platform with the versatility of the .300 AAC Blackout cartridge.

Additional Notes:

• BCG is NOT INCLUDED, but can be purchased separately.
• Rails may differ in appearance based on stock availability; rest assured, the same high-quality standards are maintained.
• Images may not be an exact representation of the product.