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.
