Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly Review

First Impressions of Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly

The AR-15 platform is a staple in the firearms world, known for its modularity and adaptability. The Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly promises to deliver a reliable and accurate solution for those looking to build or upgrade their AR-15 in the versatile 300 Blackout caliber. With its distinct diamond-cut handguard and M-Lok compatibility, it immediately suggests a blend of aesthetics and functionality that caught my eye.

As a firearms instructor and avid hunter, I often find myself advising others on building AR platforms for various purposes. I was looking for a 300 Blackout upper receiver to build a dedicated suppressed hog hunting rifle, emphasizing subsonic performance and maneuverability in thick brush. This Moriarti upper assembly appeared to offer a good balance of barrel length and handguard space for mounting accessories, all at a competitive price point.

Upon receiving the upper, my initial impression was positive. The diamond-cut handguard gives it a unique look, and the finish appeared to be well-applied. Its weight felt appropriate for a 16-inch barrel, suggesting a balance between portability and stability. Compared to similar uppers from PSA or Aero Precision, the Moriarti offering stood out due to its distinctive handguard design and advertised features for the cost. Ultimately, the combination of price, features, and aesthetics led me to choose this upper for my build. My initial excitement was tempered with a healthy dose of skepticism, eager to see how it would perform in real-world conditions.

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Real-World Testing: Putting Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly to the Test

First Use Experience

My initial test was at an outdoor range, focusing on accuracy and function. I paired the Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly with a mil-spec lower receiver and a variety of 300 Blackout ammunition, both supersonic and subsonic. The upper performed flawlessly with both types of ammunition, cycling reliably and showing no signs of malfunction.

I experienced some light rain during testing, which tested my grip on the diamond-cut handguard, which remained secure even when wet. The Moriarti upper needed minimal break-in, quickly settling into consistent groupings at 50 and 100 yards. After the first range session, I was impressed with the upper’s smooth operation and felt confident in its reliability.

Extended Use & Reliability

After several months of use, the Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly has held up remarkably well. I have taken it on multiple hog hunts in the humid Texas brush, and it has proven its durability in harsh conditions. After a particularly muddy hunt, cleaning required a bit more attention, but the nitride barrel and durable finish made it easy to remove dirt and grime.

There are minor signs of wear on the finish of the handguard, primarily around the M-Lok slots, but nothing excessive. Regular cleaning and lubrication have kept it running smoothly. Compared to some of my more expensive AR builds, this Moriarti upper has proven to be a surprisingly reliable performer, holding its own in terms of accuracy and dependability.

Breaking Down the Features of Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly

Specifications

The Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly boasts the following specifications:

• Caliber: .300 AAC Blackout. This allows for versatility in ammunition choices, from supersonic for longer-range engagements to subsonic for suppressed operation.
• Overall Length: 27.5 inches. This is a standard length for a 16-inch barrel, offering a good balance between compactness and ballistic performance.
• Barrel Length: 16 inches. This provides adequate velocity for the .300 Blackout cartridge, suitable for hunting and target shooting.
• Barrel Profile: Medium. The medium profile offers a balance between weight and heat dissipation, suitable for sustained shooting.
• Gas System Length: Pistol Length. This is ideal for the .300 Blackout, ensuring reliable cycling with a wide range of ammunition.
• Barrel Twist Rate: 1-7. This twist rate is optimized for stabilizing heavier .300 Blackout bullets, including subsonic rounds.
• Threads per Inch: 5/8×24. This is the standard thread pattern for .300 Blackout barrels, allowing for easy attachment of muzzle devices and suppressors.
• Handguard Type: Free-Float. The free-float design enhances accuracy by preventing the handguard from affecting barrel harmonics.
• Muzzle Device: A2 Flash Hider. This helps to reduce muzzle flash, aiding in low-light shooting.
• Color: Black. A standard black finish provides corrosion resistance and a tactical appearance.
• Gun Model: AR-15. Compatible with all standard AR-15 lower receivers.
• Fabric/Material: 4150 Chrome Moly Steel. The barrel is made from durable and corrosion-resistant 4150 Chrome Moly Steel.
• Gas Block Journal Size-Diameter: .750 in. This is a standard size for AR-15 gas blocks, ensuring compatibility with a wide range of aftermarket options.
• Handguard Length: 12 in. The 12-inch handguard provides ample space for mounting accessories.
• Handguard Style: M-LOK w/ Top Picatinny Rail System. This allows for versatile accessory mounting options.
• Gun Rail: M-LOK. M-LOK is a popular and lightweight attachment system for accessories.
• Gun Make: AR Platform. Designed for use with the AR-15 platform.
• Bolt Carrier Group Included: No. You must purchase a bolt carrier group separately.
• Charging Handle Included: No. You must purchase a charging handle separately.
• Magazine Included: No. This is an upper receiver assembly only.

These specifications combine to create a well-rounded upper assembly suitable for a variety of applications.

Performance & Functionality

The Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly performs admirably in its intended role. Its accuracy is commendable, consistently achieving sub-MOA groups with quality ammunition. Reliability has been flawless with a variety of loads, both suppressed and unsuppressed. The pistol-length gas system is well-tuned, ensuring smooth cycling without excessive recoil.

A potential weakness is the A2 flash hider, which, while functional, isn’t ideal for suppressed shooting. An upgraded muzzle device, such as a suppressor-ready flash hider or muzzle brake, is recommended for optimal performance with a suppressor. It exceeded my expectations for an upper in this price range, delivering consistent accuracy and reliable function.

Design & Ergonomics

The Moriarti upper boasts a unique diamond-cut handguard that’s both aesthetically pleasing and functional. The M-Lok slots provide ample space for mounting accessories, and the top Picatinny rail allows for easy optic attachment. The weight distribution feels balanced, making it comfortable to shoot for extended periods.

The only minor drawback is that the diamond-cut pattern can feel slightly aggressive on bare hands, but this is easily remedied with gloves. The intuitive design requires no specialized knowledge to operate, making it accessible to both novice and experienced shooters.

Durability & Maintenance

The 4150 Chrome Moly Steel barrel and durable black finish suggest a long lifespan with proper care. I anticipate it lasting for many years with regular cleaning and lubrication. Disassembly for cleaning is straightforward, and all components are readily accessible.

Accessories and Customization Options

The Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly is highly customizable. The M-Lok handguard allows for the attachment of various accessories, such as lights, lasers, and foregrips. The 5/8×24 threaded barrel is compatible with a wide range of muzzle devices and suppressors. The .750 gas block journal also permits easy upgrades with aftermarket gas blocks. The upper is compatible with all standard AR-15 lower receivers and magazines.

Pros and Cons of Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly

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Who Should Buy Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly?

The Moriatti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly is perfect for hog hunters seeking a reliable and accurate platform for suppressed subsonic ammunition. It’s also ideal for target shooters who want a versatile and affordable 300 Blackout AR-15 build. Home defense enthusiasts looking for a compact and maneuverable rifle in the .300 Blackout caliber will find this upper appealing.

This upper might not be the best choice for competitive shooters seeking the absolute highest level of precision, as there may be more specialized (and expensive) options available. Individuals who prefer a complete, ready-to-shoot upper assembly with a bolt carrier group and charging handle will need to consider the additional cost of these components.

A must-have accessory for optimal performance is a quality bolt carrier group and charging handle. An upgraded muzzle device, such as a suppressor-ready flash hider or muzzle brake, is highly recommended for those planning to use a suppressor.

Conclusion on Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly

The Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly offers a compelling value proposition. It delivers reliable performance, commendable accuracy, and durable construction at a competitive price point. The absence of a bolt carrier group and charging handle is a trade-off for the lower price, but the overall value remains high.

I would definitely recommend this upper to anyone looking to build or upgrade their AR-15 in .300 Blackout, especially for hunting or home defense purposes. If you’re seeking a reliable, accurate, and affordable .300 Blackout upper, look no further than the Moriarti AR-15 300 Blackout 16in Diamond Cut 12in MLok Upper Assembly.