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Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly MAR-300-10-BLK-ODG-A2 Caliber: .300 AAC Blackout, Barrel Length: 10.5 in, $29.96 Off w/ Free Shipping

Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2
Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2
Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2
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Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2
Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2
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Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2

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Questions & Answers
will this upper work on 5.56 lower Expert Answer

Yes, the Moriarti AR-15 10 inch .300 Blackout Upper Receiver is compatible with Milspec AR15 lower receivers.

by Ethan, Gear Expert, October 9, 2025
View All Q&A You Have a Question? Ask!
Caliber:
.300 AAC Blackout
Barrel Length:
10.5 in
Barrel Profile:
Medium
Gas System Length:
Pistol Length
Barrel Twist Rate:
1-7
Firearms Threads Per Inch:
5/8x24
Handguard Type:
Free-Float
Muzzle Device:
A2 Flash Hider
Finish:
Hardcoat Anodized
Color:
Black/OD Green
Gun Model:
AR-15
Gas Block Journal Size-Diameter:
.750 in
Handguard Length:
10 in
Barrel Material:
4150 CMV Steel

Code: 5MY-UFH-N72AET-MAR-300-10-BLK-ODG-A2

MPN: MAR-300-10-BLK-ODG-A2

UPC: 799787099030

List: $399.95Save $29.96
$369.99

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly

Moriarti AR-15 300 Blackout Pistol Upper Assembly / 10 in Od Green M-lok / A2 is a perfect addition to your pistol look. Just drop this pistol upper assembly on your Mil-Spec lower receiver and enjoy the outdoors.image

WARNING: California`s Proposition 65

Specifications for Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly:

Manufacturer: Moriarti
Caliber: .300 AAC Blackout
Barrel Length: 10.5 in
Barrel Profile: Medium
Gas System Length: Pistol Length
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 5/8x24
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Finish: Hardcoat Anodized
Color: Black/OD Green
Gun Model: AR-15
Fabric/Material: 7075-T6 Aluminum
Gas Block Journal Size-Diameter: .750 in
Handguard Length: 10 in
Gun Rail: M-LOK
Gun Make: AR Platform
Barrel Material: 4150 CMV Steel
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Mount Type: M-LOK

Package Contents:

  • Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly

What firearm models does the manufacturer say Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly is compatible with?

The manufacturer says that Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly is compatible with AR-15

Moriarti AR-15 10 inch .300 Blackout Upper Receiver with Flash Hider Assembly Orderable Models

List of Orderable Models

  • Moriarti Upper Receiver with Flash Hider, AR-15, .300 Blackout, 10.5 inch Barrel, Medium Profile, Pistol Length, 1x7 Twist, 5/8X24 Thread, M-LOK Handguard, A2 Flash Hider, Hardcoat Anodized, Black/ Od Green, MAR-300-10-BLK-ODG-A2 , MPN: MAR-300-10-BLK-ODG-A2 , UPC: 799787099030 , Code: 5MY-UFH-N72AET-MAR-300-10-BLK-ODG-A2
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Last updated 2026-08-24 UTC.