First Impressions of OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider
The OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider promises a compact and powerful AR platform in the versatile 300 Blackout caliber. The allure of building a short-barreled rifle (SBR) or pistol with improved close-quarters maneuverability and subsonic capabilities is hard to resist, and this upper receiver seemed like an affordable entry point. I was particularly drawn to the Moriarti name, hoping for a reliable build despite the budget-friendly price.
I was looking to build a dedicated home defense AR pistol. I wanted something compact and chambered in a caliber known for its effectiveness in close quarters, with subsonic ammo compatibility for suppressed use down the line. I had been eyeing similar uppers from other manufacturers, but the OpticsPlanet Exclusive caught my attention due to its price point and the promise of a unique burnt bronze finish.
Upon unboxing, the burnt bronze finish was the first thing that struck me. It’s a unique color that definitely stands out from the standard black AR components. The upper receiver felt solid in hand, but I immediately noticed the A2 flash hider and the M-LOK handguard, which appeared well-machined.
Compared to complete uppers from Bravo Company Manufacturing (BCM) or Daniel Defense, this Moriarti upper is significantly more affordable. I chose this over the more expensive options to experiment with a budget build, hoping I could achieve acceptable performance without breaking the bank, fully expecting to make some minor tweaks. My first impression was cautiously optimistic, but I was also aware that some user reviews mentioned potential issues with the gas block and barrel nut.
My initial excitement was tempered by the knowledge of potential quality control issues reported by other users. I was eager to test it out but also prepared to address any problems that might arise.
Real-World Testing: Putting OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider to the Test
First Use Experience
My first range trip with the OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider was on an outdoor range in relatively mild conditions (70 degrees Fahrenheit, clear skies). I tested it with both supersonic (110gr VMAX) and subsonic (220gr Sierra MatchKing) ammunition. Immediately I experienced cycling issues.
The upper failed to cycle reliably with either supersonic or subsonic ammo straight out of the box. It was immediately apparent why some users had issues. The bolt frequently failed to lock back on an empty magazine with supersonic ammo, and subsonic rounds would often short-stroke, failing to eject altogether.
Extended Use & Reliability
After several range trips and some necessary adjustments, the OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider has become more reliable, but not without some tinkering. After tightening the barrel nut to the proper torque spec, the upper started cycling more reliably.
I’ve put approximately 500 rounds through it since the initial adjustments. There are no signs of significant wear and tear on the receiver itself. However, the finish on the A2 flash hider is already showing signs of discoloration after repeated use.
Compared to my experience with higher-end uppers, the Moriarti requires more attention to detail and a willingness to troubleshoot. While it’s now functioning reasonably well, it’s not quite as confidence-inspiring as my BCM upper, which has run flawlessly since day one. The cheaper price comes with compromises in fit and finish tolerances.
Breaking Down the Features of OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider
Specifications
The OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider features a 10.5-inch barrel chambered in .300 AAC Blackout. It has a medium barrel profile with a 1-7 twist rate. This twist rate is optimal for stabilizing both supersonic and subsonic projectiles.
The upper receiver uses a pistol-length gas system. It is crucial for reliable cycling with the short barrel. The muzzle is threaded 5/8×24 for compatibility with most 300 Blackout suppressors and muzzle devices.
The upper comes with a 10-inch free-float M-LOK handguard. The M-LOK system allows for easy attachment of accessories. It also features an A2 flash hider and a burnt bronze finish.
These specifications are standard for a 300 Blackout AR pistol build. The pistol length gas system is a must-have. The 1-7 twist rate provides versatility for a wide range of bullet weights.
Performance & Functionality
After addressing the initial issues with the barrel nut and gas block alignment, the OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider performs adequately. Accuracy is acceptable for close to medium-range engagements. Expect around 2-3 MOA with quality ammunition.
Its strength is its compact size and the versatility of the 300 Blackout cartridge. The weaknesses include potential initial reliability issues and a somewhat rough fit and finish compared to premium brands. It meets expectations for a budget-friendly upper, but doesn’t exceed them.
Design & Ergonomics
The burnt bronze finish gives the upper a distinctive look. It sets it apart from the sea of black ARs. The M-LOK handguard is comfortable to grip and provides ample space for mounting accessories.
The build quality is acceptable for the price point. But the finish isn’t as smooth or durable as higher-end options. There’s a slight learning curve in terms of troubleshooting potential reliability issues. But once dialed in, it’s relatively user-friendly.
Durability & Maintenance
The upper receiver itself seems durable enough. But the finish on the flash hider is prone to wear. Cleaning and maintenance are standard for an AR-15. Regular lubrication of the bolt carrier group is essential.
With proper care, the upper should last for several thousand rounds. However, some components, like the flash hider, may need to be replaced sooner than on a more expensive upper. The 300 Blackout chamber requires additional care due to carbon build-up.
Accessories and Customization Options
The OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider is highly customizable. The M-LOK handguard allows for easy attachment of grips, lights, and lasers. The 5/8×24 muzzle threads are compatible with most 300 Blackout suppressors and muzzle devices.
The upper is compatible with any standard AR-15 lower receiver. A red dot sight or holographic sight is almost essential for optimal performance with this short-barreled configuration. Upgrading the trigger can also improve accuracy and overall shooting experience.
Pros and Cons of OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider
Pros
- Affordable Entry Point: An inexpensive way to get into the 300 Blackout AR pistol platform.
- Unique Aesthetics: The burnt bronze finish offers a distinctive look.
- M-LOK Handguard: Provides ample space for accessory mounting.
- Versatile Caliber: The 300 Blackout is effective for both home defense and hunting.
- Compact Size: The 10.5-inch barrel makes it maneuverable in tight spaces.
Cons
- Potential Reliability Issues: May require troubleshooting and adjustments out of the box.
- Fit and Finish: Not as refined as higher-end brands.
- Quality Control: Barrel nut and gas block require inspection/adjustment prior to firing.
Who Should Buy OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider?
The OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider is perfect for budget-conscious builders. It suits those looking to experiment with the 300 Blackout caliber without a large initial investment. It’s also suitable for hobbyists comfortable with tinkering and troubleshooting.
Those seeking a premium, out-of-the-box reliable upper should skip this product. First-time AR builders who are intimidated by mechanical work might also want to consider a more established brand. It may be more appropriate to pay more to ensure all torquing and assembly has been done correctly from the factory.
A must-have accessory is a quality red dot sight. A reliable bolt carrier group (BCG) is also recommended to ensure smooth cycling. Consider upgrading the trigger for improved accuracy and feel.
Conclusion on OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider
The OpticsPlanet Exclusive Moriarti AR-15 10.5in 300 Blackout Upper Receiver, A2 Flash Hider offers an affordable entry point into the world of 300 Blackout AR pistols. However, buyers should be aware that it may require some initial adjustments and troubleshooting to achieve optimal performance.
The value proposition is decent, considering the price point and the versatility of the 300 Blackout caliber. But it’s essential to factor in the potential need for additional parts or gunsmithing services to address any initial issues.
I would cautiously recommend it to experienced AR builders who are comfortable with working on their firearms. If you’re willing to put in the time and effort to fine-tune it, the Moriarti upper can be a fun and capable platform. But if you demand out-of-the-box reliability, you’re better off investing in a higher-end option. Consider this a project gun with potential, but proceed with realistic expectations.