Pistol Length

AR-15 300 Blackout 5" Centurion Upper Assembly / MLOK – Choose Handguard Color

5 Inch 300 Blackout Pistol Upper – Centurion M-LOK Edition

Unleash compact performance with the Moriarti 5 Inch 300 Blackout Pistol Upper Assembly – Centurion Edition. Designed for shooters building lightweight and maneuverable AR-15 pistols, this upper combines a short 5-inch .300 AAC Blackout barrel, precision-machined components, and a customizable M-LOK handguard system.

The Centurion upper delivers the versatility of the .300 AAC Blackout cartridge in a compact AR-15 configuration while maintaining compatibility with standard AR-15 lower receivers and common AR-15 components.

Choose your preferred handguard color to create a personalized build that stands apart from traditional AR configurations.

Key Features at a Glance

Caliber: .300 AAC Blackout
Platform: AR-15
Configuration: Pistol Upper Assembly
Barrel Length: 5"
Barrel Profile: Government Profile
Barrel Material: 4150V Steel
Barrel Finish: Nitride Treated
Twist Rate: 1:7
Gas System: Micro Length Gas System
Muzzle Device: Centurion Compensator
Muzzle Thread: 5/8x24
Handguard: 4" Airlock Series M-LOK Compression Free Float Handguard
Handguard Options: Multiple Color Choices Available
Upper Receiver: A3 Flat Top 7075-T6 Aluminum
BCG & Charging Handle: Not Included

Features

Compact .300 AAC Blackout Performance

The .300 AAC Blackout cartridge is known for its excellent performance in short-barrel AR-15 configurations. This 5-inch upper is designed for shooters who want a compact platform while maintaining the flexibility of using both supersonic and subsonic ammunition.

5" Nitride Government Profile Barrel

The 5-inch 4150V steel barrel provides a durable foundation for a compact AR-15 pistol build.

Features include:

• Nitride finish for corrosion resistance
• Heat-treated construction
• 1:7 twist rate for projectile stabilization
• M4 feed ramps
• .750 gas block diameter

Centurion Compensator

The Centurion Compensator provides a distinctive appearance while helping manage muzzle movement during shooting.

Features:

• 5/8x24 thread pattern
• Designed for short-barrel AR platforms
• Helps reduce muzzle rise
• Improves control during follow-up shots

Customizable Airlock M-LOK Handguard

The 4-inch Airlock Series M-LOK Compression Free Float Handguard provides a lightweight and durable mounting platform.

Features:

• T6 aluminum construction
• Free-float design
• Monolithic top rail
• M-LOK accessory compatibility
• Multiple color options available

Customize your build with a handguard color that matches your preferred style.

Precision AR-15 Upper Receiver

The A3 flat-top upper receiver is manufactured from certified 7075-T6 aluminum and hardcoat anodized to government specifications.

Includes:

• Forward assist installed
• Dust cover installed
• Standard AR-15 compatibility

Perfect For

The Moriarti 5 Inch 300 Blackout Pistol Upper is ideal for:

• Compact AR-15 pistol builds
• 300 BLK conversions
• Lightweight AR builds
• Range shooting
• Custom color-matched builds
• Shooters looking for a unique short-barrel configuration

Frequently Asked Questions

Will this 5 inch 300 Blackout pistol upper fit my AR-15 lower?

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

Does this upper include a bolt carrier group?

No. The BCG and charging handle are not included but can be purchased separately.

What makes this Centurion upper different?

The Centurion Edition features a compact 5-inch .300 Blackout barrel, Centurion Compensator, and customizable Airlock M-LOK handguard options, allowing builders to create a unique AR-15 pistol configuration.

Can I shoot subsonic and supersonic ammunition?

Yes. The .300 AAC Blackout cartridge was designed to support both ammunition types. Performance depends on ammunition selection and overall firearm configuration.

Is this upper suppressor compatible?

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

Related Products

300 Blackout Uppers

300 Blackout Pistols

300 Blackout Build Kits

AR-15 Lower Receivers

Additional Information:

• Bolt Carrier Group (BCG) and Charging Handle (CH) are not included but can be purchased separately.

• Images may not be an exact representation of the product. Variations in the handguard design may occur based on stock availability, but rest assured, the quality remains top-notch.