First Impressions of Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly immediately grabbed my attention with its aggressive styling and compact profile. From Moriarti Armaments, this upper assembly promises a blend of maneuverability and firepower, centered around a short 7.5-inch barrel and a distinctive “Shark” muzzle brake. This upper is marketed towards those seeking a compact AR-15 pistol build, and its eye-catching design certainly makes a statement.
For years, I’ve been on the hunt for the ultimate compact AR-15 upper receiver. I wanted something lightweight and easy to maneuver in tight spaces for home defense and vehicle carry, but also reliable and accurate enough for recreational shooting. I needed to find the right balance of compactness and capability.
The Moriarti upper arrived well-packaged. My first impression was positive, noting the dark, uniform finish and the solid feel of the M-LOK handguard. The Shark muzzle brake is definitely a conversation starter, giving it a unique look, but I was initially concerned if it would function as good as it looked.
Compared to other short-barreled uppers I’ve used, the Moriarti offering seemed more deliberately designed for aesthetics. A similar product I have used is a Bear Creek Arsenal 7.5″ upper, which I found to be lacking in the fit and finish department. I chose the Moriarti because I was hoping for something with a more complete fit and finish. I was eager to see if the Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly lived up to the hype or if it was just another flashy piece of kit.
Real-World Testing: Putting Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly to the Test
First Use Experience
I first took the Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly to my local outdoor range. The weather was dry and sunny, a perfect day for testing. I mounted the upper onto my existing AR-15 pistol lower receiver and loaded up some 55-grain FMJ rounds.
The first few shots were a bit of a surprise. The muzzle blast from the 7.5-inch barrel was significant, and the Shark muzzle brake definitely directed the sound and concussion forward and to the sides, making it less comfortable for those standing nearby. I needed to adjust my stance and grip to manage the increased recoil compared to my longer rifles. After the first few shots, I realized that the handguard became hotter to the touch quickly compared to my longer barreled AR rifles.
Extended Use & Reliability
After several range sessions and a few hundred rounds, the Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly has proven to be surprisingly reliable. I have not experienced any failures to feed or extract. The finish shows only minor wear around the ejection port, which is acceptable for an AR-15.
Cleaning the upper is straightforward, but the Shark muzzle brake requires extra attention to remove carbon buildup. Compared to my experiences with other short-barreled AR-15s, the Moriarti upper holds its own in terms of reliability, but the increased recoil and muzzle blast are something to consider. In comparison to a 10.5″ upper I have used, the 7.5″ is noticably more difficult to shoot comfortably and accurately.
Breaking Down the Features of Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly
Specifications
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly boasts a range of features designed for compact performance. Its core specifications include:
- Caliber: 5.56mm/.223
- Overall Length: 16.5 inches
- Barrel Length: 7.5 inches. This short barrel is the heart of its compact design, offering maximum maneuverability.
- Barrel Profile: Government
- Gas System Length: Pistol Length. The pistol-length gas system is necessary for reliable cycling with the short barrel.
- Barrel Twist Rate: 1-7. This twist rate is ideal for stabilizing a wide range of bullet weights, from lightweight varmint rounds to heavier projectiles.
- Threads per Inch: 1/2×28
- Handguard Type: Free-Float. The free-float design enhances accuracy by preventing the handguard from affecting barrel harmonics.
- Muzzle Device: Shark Muzzle Brake. This is a distinctive feature, designed to reduce recoil and muzzle climb while also looking aggressive.
- Color: Black
- Fabric/Material: 4150 CMV. The use of 4150 CMV steel ensures the barrel is durable and heat-resistant.
- Gas Block Journal Size-Diameter: .750 in
- Handguard Length: 7 in
- Handguard Style: M-LOK w/ Top Picatinny Rail System. This provides ample space for attaching accessories like lights, lasers, and optics.
- Gun Rail: M-LOK
- Weight: 2.3 lb
- Bolt Carrier Group Included: No
- Magazine Included: No
- Charging Handle Included: No
- Mount Type: M-LOK
These specifications collectively contribute to a lightweight and compact upper assembly. The 7.5-inch barrel and Shark muzzle brake define its character, while the M-LOK handguard offers excellent versatility.
Performance & Functionality
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly is designed for close-quarters performance. Its short barrel makes it incredibly maneuverable, ideal for home defense or vehicle carry. However, the short barrel also results in a significant loss of velocity, impacting the effective range and terminal ballistics of the 5.56/.223 cartridge.
One of the strengths of this upper is its reliability with standard ammunition. The cycling is smooth, and I experienced no malfunctions during my testing. The Shark muzzle brake, while visually striking, is extremely loud and concussive, making it unpleasant to shoot without proper ear protection. While it does reduce muzzle climb, the recoil is still noticeable due to the short barrel.
Design & Ergonomics
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly has a sleek and aggressive design. The finish is uniform and durable, and the M-LOK handguard is comfortable to grip. The Shark muzzle brake adds a unique aesthetic that some will find appealing, while others may find it over the top.
There is no learning curve to using this upper assembly. Simply attach it to a compatible lower receiver, and it’s ready to go. The controls are standard AR-15, making it familiar to most shooters.
Durability & Maintenance
The 4150 CMV barrel and robust construction suggest that the Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly is built to last. After several range sessions, there are no signs of excessive wear or damage. Regular cleaning and lubrication are essential to maintain its performance.
Disassembling the upper for cleaning is straightforward, although the Shark muzzle brake can be a bit tricky to remove and clean thoroughly. The M-LOK handguard is easy to remove, providing access to the barrel and gas system.
Accessories and Customization Options
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly is highly customizable. The M-LOK handguard allows for the attachment of various accessories, such as vertical grips, lights, and lasers. The top Picatinny rail provides ample space for mounting optics, from red dot sights to holographic sights.
Because this is an AR-15 upper, it is compatible with almost all accessories designed for the AR-15 platform. Just keep in mind the limitations of a very short barrel.
Pros and Cons of Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly
Pros
- Compact and Maneuverable: The 7.5-inch barrel makes it ideal for close-quarters situations and easy storage.
- Reliable Cycling: Functions reliably with a wide range of ammunition.
- Aggressive Styling: The Shark muzzle brake and overall design make a statement.
- Versatile M-LOK Handguard: Provides ample space for attaching accessories.
- Durable Construction: The 4150 CMV barrel and robust build ensure longevity.
Cons
- Excessive Muzzle Blast: The Shark muzzle brake directs a significant amount of noise and concussion to the sides.
- Reduced Ballistics: The short barrel results in a significant loss of velocity, limiting effective range.
- Handguard Heats Up Quickly: The handguard becomes hotter to the touch compared to longer AR-15 uppers.
Who Should Buy Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly?
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly is perfect for individuals seeking a compact and maneuverable AR-15 pistol for home defense, vehicle carry, or recreational shooting at close ranges. Those who prioritize aesthetics and appreciate aggressive styling will also find it appealing.
This product is not suitable for those who prioritize long-range accuracy or are sensitive to loud noises and muzzle blast. Shooters looking for a more versatile AR-15 platform for both close-quarters and longer-range engagements should consider a longer barrel length.
A must-have accessory for this upper is a high-quality ear protection. A red dot sight is also recommended for quick target acquisition at close ranges.
Conclusion on Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly
The Moriarti AR-15 5.56/.223 7.5in Pistol Shark Mlok Upper Assembly is a unique and attention-grabbing option for those seeking a compact AR-15 pistol. It delivers reliable performance and offers plenty of customization options, but its excessive muzzle blast and limited effective range are drawbacks to consider. The value proposition is fair, considering its features and build quality.
I would recommend this upper to those who understand its limitations and appreciate its aggressive styling and maneuverability. If you’re looking for a compact AR-15 that makes a statement, this might be the upper for you. Just be sure to wear your ear protection!