Moriarti AR-15 300 Blackout 16" Black Shark Upper – 12" MLOK / Custom Brake

AR-15 Line

AR-15 300 Blackout 16" Med Profile Black Shark Upper Assembly / Mlok

The Moriarti AR-15 300 Blackout 16" Black Shark Upper Assembly delivers fierce performance and compliance in a sleek, custom configuration. Designed with shooters in restrictive states in mind, this upper is CA and NY compliant and crafted for tactical reliability and eye-catching aesthetics.

Built around a 16” medium profile barrel, this upper utilizes 4150 CMV steel, heat-treated and nitride-coated for long-lasting durability. The 1:7 twist rate and M4 feedramps ensure subsonic and supersonic rounds are stabilized with precision.

What sets this assembly apart is its 4" custom steel Shark muzzle brake—a bold design element that reduces muzzle rise and adds aggressive style. The 12” mid-length slim M-LOK handguard gives you plenty of room to mount lights, grips, or optics with ease.

Finished with a 7075-T6 forged upper receiver, hardcoat anodized to government specs, the Black Shark upper is a precision component ready to perform.

Specifications:

• Chamber: 300 AAC Blackout

• Barrel: 16" Medium Profile, 4150 CMV, Nitride Finish

• Twist Rate: 1:7 Button Rifled

• Thread Pattern: 5/8x24

• Muzzle Device: Custom 4" Steel Shark Muzzle Brake

• Gas System: Pistol Length

• Gas Block Diameter: .750

• Handguard: 12” Mid-Length M-LOK Slim Rail

• Receiver: A3 Flat Top, 7075-T6 Forged Aluminum, Hardcoat Anodized

• Extras: Forward Assist and Dust Cover Installed

• BCG & Charging Handle: Not Included (Available Separately)

Perfect For:

• State Compliant AR-15 Builds (CA/NY Legal)

• Tactical and Home Defense Setups

• Shooters Seeking Custom Aesthetics with Proven Performance

• For short barrel builds, check out the Moriarti AR-15 300 Blackout 10.5" Upper

Images may not be an exact representation of the product.