Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly Review

First Impressions of Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly

The AR-15 platform is a staple in the firearms community, known for its modularity and versatility. The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly promises to be a cost-effective option for those looking to build or upgrade their existing rifle. Boasting a 16-inch barrel, M4 profile, and a distinctive diamond-cut M-Lok handguard, it certainly catches the eye.

I’ve been building ARs for over a decade, constantly seeking that balance between performance and value. I needed an upper receiver for a lightweight build focused on maneuverability for close to medium-range engagements during tactical training scenarios. My initial draw to this upper was the M-Lok handguard and the promise of a lightweight, accurate platform without breaking the bank.

Upon unboxing, I was immediately struck by the aggressive look of the diamond-cut handguard. The weight felt appropriate for a 16-inch barrel, suggesting a good balance between durability and portability. The finish appeared to be a standard black, and while not fancy, it seemed even and well-applied.

Compared to other uppers I’ve used, like those from Bravo Company Manufacturing (BCM) and Aero Precision, the price point of the Moriarti is significantly lower. While BCM and Aero are known for their stringent quality control and premium components, I was curious to see if this Moriarti upper could deliver acceptable performance for the price. My first impression was cautiously optimistic – hoping the aesthetics matched the performance.

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Real-World Testing: Putting Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly to the Test

First Use Experience

I first tested the Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly at my local shooting range. The weather was sunny, but a slight breeze was present, which is typical for the area. After installing the upper onto a mil-spec lower receiver with a quality trigger, I ran about 200 rounds of mixed 5.56 NATO ammunition through it.

The upper functioned flawlessly through the first 200 rounds with no failures to feed or eject. The carbine-length gas system felt appropriately tuned. While I appreciated the smooth cycling, I found the standard A2 flash hider to be rather ineffective at mitigating muzzle flash.

Extended Use & Reliability

After several range sessions and approximately 1000 rounds fired, the Moriarti upper has held up surprisingly well. There are minor scratches on the finish, particularly around the ejection port, which is expected. Cleaning is straightforward. Standard AR-15 cleaning procedures work perfectly.

The diamond-cut handguard has proven to be durable and comfortable, even during extended firing sessions. Compared to my experiences with premium uppers, the Moriarti lacks the same level of refinement in its finish and some of its components, but it continues to function reliably. For the price, it has exceeded my expectations.

Breaking Down the Features of Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly

Specifications

The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly features the following specifications:

• Caliber: 5.56x45mm NATO – This is the ubiquitous AR-15 caliber, offering readily available ammunition and a good balance of power and recoil.
• Overall Length: 27.5 inches – This is a standard length for a 16-inch barrel AR, providing good maneuverability.
• Barrel Length: 16 inches – The 16-inch barrel is the legal minimum for a rifle, offering a good compromise between velocity and compactness.
• Barrel Profile: M4 – The M4 profile helps reduce weight without sacrificing too much rigidity.
• Gas System Length: Carbine Length – This is a common gas system length known for its reliability, especially with 16-inch barrels.
• Barrel Twist Rate: 1-7 – The 1-7 twist rate is ideal for stabilizing heavier bullets, generally 62 grains and above.
• Threads per Inch: 1/2×28 – This is the standard thread pitch for 5.56 barrels, ensuring compatibility with a wide range of muzzle devices.
• Handguard Type: Free-Float – Free-floating the barrel enhances accuracy by preventing pressure from the handguard affecting barrel harmonics.
• Muzzle Device: A2 Flash Hider – While functional, the A2 flash hider is basic and can be easily upgraded.
• Color: Black – A standard black finish provides a uniform look and helps protect against corrosion.
• Gun Model: AR-15 – The upper is designed for the AR-15 platform, ensuring compatibility with mil-spec lower receivers.
• Fabric/Material: 4150 Chrome Moly Steel – 4150 CMV steel is a durable and reliable material for AR-15 barrels.
• Gas Block Journal Size-Diameter: .750 in – .750 is a common gas block journal size, offering good compatibility with aftermarket gas blocks.
• Handguard Length: 12 inches – The 12-inch handguard provides ample space for mounting accessories.
• Handguard Style: M-LOK w/ Top Picatinny Rail System – The M-Lok system allows for easy attachment of accessories, while the Picatinny rail provides a mounting platform for optics.
• Gun Rail: M-LOK – M-Lok offers a lightweight and versatile system for attaching accessories.
• Gun Make: AR Platform – Designed specifically for AR-15/AR-15 platform builds.
• Bolt Carrier Group Included: No – The absence of a BCG reduces the overall cost but requires the user to purchase one separately.
• Charging Handle Included: No – Similar to the BCG, not including a charging handle helps keep the cost down.
• Magazine Included: No – Upper assemblies typically do not include magazines.

Performance & Functionality

The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly functions reliably as a basic AR-15 upper. Accuracy is acceptable for its intended purpose; I was able to achieve consistent 2-3 MOA (Minute of Angle) groupings at 100 yards with quality ammunition and a decent optic. The carbine-length gas system provides smooth cycling and manageable recoil.

However, the A2 flash hider is a definite weakness. It does little to mitigate muzzle flash, especially with shorter barrel lengths. I would highly recommend upgrading this to a more effective muzzle device. Overall, the upper performs as expected for its price point, offering reliable functionality without any standout features.

Design & Ergonomics

The diamond-cut M-Lok handguard is the most distinctive design element of this upper. It provides a comfortable grip and plenty of space for mounting accessories. The build quality is adequate, with no glaring imperfections.

However, the finish is basic and prone to scratching. The weight is reasonable for a 16-inch barrel, making it comfortable to handle for extended periods. There’s no real learning curve here, making it very user-friendly.

Durability & Maintenance

The 4150 Chrome Moly barrel should offer good durability for the average shooter. Routine cleaning and lubrication are all that’s needed to keep it running smoothly. While it’s not designed for extreme use, with proper care, it should last a long time.

Accessories and Customization Options

The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly is highly customizable. The M-Lok handguard allows for the attachment of a wide range of accessories, such as lights, lasers, and vertical grips. The Picatinny rail on top of the upper receiver is compatible with most optics.

As mentioned earlier, upgrading the muzzle device is a worthwhile modification. This upper is compatible with any standard AR-15 bolt carrier group and charging handle.

Pros and Cons of Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly

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Who Should Buy Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly?

The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly is perfect for budget-conscious builders, casual range shooters, and those looking for a reliable AR-15 for home defense. This upper is also a solid choice for anyone wanting to assemble a backup AR without spending a fortune.

Those seeking match-grade accuracy, extreme durability, or a premium fit and finish should skip this product. A higher-end upper from manufacturers like BCM, Daniel Defense, or Geissele would be a better fit.

Must-have accessories or modifications include a quality bolt carrier group, charging handle, and an upgraded muzzle device (flash hider or compensator).

Conclusion on Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly

The Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly offers a compelling value proposition. It provides reliable AR-15 functionality at an incredibly affordable price. While it lacks the refinement of higher-end options, its core components are well-made and offer sufficient performance for a wide range of applications.

The price is definitely justified for what you get. Considering the rising costs of firearms and components, this upper is a great way to get into the AR-15 game without breaking the bank.

I would personally recommend it to anyone on a tight budget or those looking for a reliable backup upper. If you are looking for a low-cost, functional, and customizable AR-15 upper receiver, the Moriarti AR-15 5.56 Nato 16in M4 Carbine Diamond Cut 12in MLok Upper Assembly is a solid choice.