Moriarti AR-15 300 Blackout 14.5" Slim M-LOK Upper Assembly - 12" Free-Float Handguard / Thread Protector / 1X7 Twist

AR-15 Line

Moriarti AR-15 300 Blackout 14.5" Slim M-LOK Upper Assembly - 12" Free-Float Handguard / Thread Protector / 1X7 Twist

The Moriarti 14.5" 300 Blackout Upper Assembly delivers the versatility of 300 AAC Blackout in a longer-barrel AR-15 configuration. Designed for shooters seeking a premium 14.5 300 Blackout upper, this assembly provides an excellent platform for hunting, recreational shooting, and custom AR-15 projects.

The 14.5-inch 300 BLK barrel provides additional barrel length for shooters who prioritize supersonic performance while retaining the versatility that makes 300 Blackout popular. Built with quality AR-15 components for dependable cycling, accuracy, and durability, this 300 Blackout upper is compatible with Mil-Spec AR-15 lower receivers and standard AR-15 components where applicable.

Key Features:

• Cartridge: 300 Blackout – Ideal for both suppressed and unsuppressed shooting.
• Barrel Length: 14.5" – Balanced for maneuverability and performance.
• Barrel Profile: Medium Profile – Ideal for precision and durability.
• Barrel Material: 4150 Chrome Moly Steel – Known for strength and longevity.
• Barrel Finish: Black Nitride – Enhances durability, corrosion resistance, and performance.
• Twist Rate: 1:7 – Perfect for stabilizing a wide range of bullet weights.
• Gas System: Pistol-Length Gas System – Optimized for reliability and smoother cycling.
• Muzzle Device: Thread Protector – Protects the threads for future muzzle device installation.
• Upper Receiver: 7075-T6 Forged Aluminum – Strong, lightweight, and built to last.
• Handguard: 12" Slim M-LOK Free Float Rail – Slim, ergonomic, and ideal for attaching accessories.
• Thread Pitch: 5/8x24 – Standard for many AR-15 barrels and muzzle devices.
• M4 Feedramps – Ensures smoother feeding and reliability.
• Gas Block Size: .750 – Compatible with a wide range of gas blocks.

Specifications:

• Overall Length: 14.5 in
• Twist Rate: 1:7
• Barrel Material: 4150V Chrome Moly Steel
• Barrel Finish: Black Nitride
• Gas System: Pistol Length
• Muzzle Device: Thread Protector (Nitride Coated)
• Handguard Length: 12 in
• Handguard Type: Slim M-LOK Free Float
• Gas Block Diameter: .750 in
• Receiver Material: 7075-T6 Forged Aluminum
• Receiver Finish: Black Hardcoat Anodized

Package Contents:

• Moriarti AR-15 300 Blackout 14.5" Slim M-LOK Upper Assembly
• 12" M-LOK Free Float Handguard
• Thread Protector (Nitride Coated)

Is a 14.5-inch barrel good for 300 Blackout?

Yes. While 300 Blackout is well known for performing efficiently from short barrels, a 14.5-inch 300 Blackout upper can be an excellent choice for shooters who primarily use supersonic ammunition and want additional velocity from a longer barrel. Recent enthusiast discussion also shows 14.5" 300 BLK being used specifically for hunting-oriented configurations.

Note:
This upper assembly does not come with a Bolt Carrier Group (BCG) or Charging Handle. These can be purchased separately. The mlok handguard design may vary based on stock availability, but all components maintain excellent quality.