First Impressions of OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly
The AR-9 platform has exploded in popularity, offering a versatile and controllable pistol caliber carbine (PCC) option for everything from home defense to range fun. The OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly aims to deliver a compact and reliable entry point into this world. With its short barrel and free-float handguard, it promises maneuverability and potential for customization.
My interest in this particular upper receiver assembly stemmed from a desire to build a dedicated home defense AR-9 pistol. I wanted something compact, chambered in an affordable and readily available caliber, and easily maneuverable in tight spaces. I’ve already got a 16″ AR-15, but it can be a bit unwieldy indoors.
Upon unboxing, the first thing I noticed was the solid feel of the upper. The anodized finish appeared even and well-applied, and the M-LOK handguard felt sturdy. The 4.5-inch barrel, coupled with the multiport muzzle brake, gives the upper a distinctly aggressive look.
I was also considering a similar upper from PSA and another from Foxtrot Mike, but ultimately chose the Moriarti due to its OpticsPlanet exclusivity and competitive price point. The promise of quality components and reliable performance sealed the deal. My initial excitement was high, tempered with the usual skepticism until I could get it to the range.
Real-World Testing: Putting OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly to the Test
First Use Experience
My first outing with the OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly was at my local indoor range. The range had a good climate and was well-lit, so this helped me get used to the product. I paired the upper with a dedicated 9mm lower receiver and a variety of 9mm ammunition ranging from 115 grain FMJ to 147 grain JHP.
The initial performance was impressive. The multiport muzzle brake effectively mitigated recoil, allowing for quick follow-up shots. Accuracy was acceptable at 25 yards, easily keeping rounds within a 4-inch group. There were no failures to feed or eject during the first 100 rounds, which was encouraging.
Extended Use & Reliability
After several range trips and approximately 500 rounds fired, the Moriarti upper has proven to be remarkably reliable. I have experienced no malfunctions related to the upper itself. I’ve noticed a slight increase in carbon buildup around the muzzle brake, which is to be expected with a direct blowback system.
Cleaning and maintenance have been straightforward. Standard AR-15 cleaning tools and solvents work perfectly. Regular lubrication of the bolt carrier group is essential to ensure smooth operation. Compared to my experience with some cheaper AR-9 uppers, this one has noticeably outperformed in terms of reliability and ease of maintenance.
Breaking Down the Features of OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly
Specifications
The OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly boasts several key specifications that contribute to its performance. It is chambered in 9mm Luger, making it compatible with a wide range of affordable ammunition. The 4.5-inch barrel offers excellent maneuverability in confined spaces.
The 1-10 twist rate is optimized for stabilizing common 9mm bullet weights. It features a free-float handguard with M-LOK attachment points for accessories. The multiport muzzle brake effectively reduces felt recoil and muzzle rise. It is finished with a durable anodized coating in black.
Performance & Functionality
The primary function of this upper receiver is to reliably chamber, fire, and eject 9mm ammunition, which it performs admirably. The short barrel does result in a slight reduction in muzzle velocity compared to longer barrels. However, this is a trade-off for increased maneuverability. Accuracy is more than adequate for its intended purpose, such as home defense and close-quarters shooting.
The main strength of the OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly is its reliability and compact size. A potential area for improvement would be the addition of a forward assist, although its absence hasn’t been an issue so far. Overall, it meets and exceeds my expectations for a compact AR-9 upper.
Design & Ergonomics
The design of the Moriarti upper is simple and functional. The M-LOK handguard provides ample space for mounting lights, lasers, and other accessories. The overall weight is well-balanced, making it comfortable to handle. There is no significant learning curve, especially for those familiar with the AR platform.
The build quality is solid. The materials used appear to be of high quality. The anodized finish is even and provides good protection against corrosion. The weight is appropriate for a pistol caliber carbine.
Durability & Maintenance
Based on my experience so far, I expect the OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly to last for many years with proper care. The anodized finish should withstand normal wear and tear. As mentioned earlier, cleaning and maintenance are straightforward.
Regular lubrication and occasional inspection of the bolt carrier group are recommended. Replacement parts are readily available, as it is based on the widely popular AR platform.
Accessories and Customization Options
The M-LOK handguard provides a versatile platform for attaching a wide range of accessories. I’ve added a weapon light, a red dot sight, and a vertical foregrip to mine. The upper is compatible with most standard AR-15 lower receivers designed for 9mm.
While no specific accessories come with the upper (besides the muzzle brake), the possibilities for customization are virtually endless. Compatibility with aftermarket triggers, charging handles, and other AR-15 components further enhances its versatility.
Pros and Cons of OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly
Pros
- Compact and maneuverable: The 4.5-inch barrel makes it ideal for tight spaces.
- Reliable performance: I have experienced no malfunctions in 500 rounds.
- Affordable: The price point is competitive compared to other AR-9 uppers.
- M-LOK handguard: Offers ample space for mounting accessories.
- Effective muzzle brake: Significantly reduces felt recoil and muzzle rise.
Cons
- No forward assist: While not essential, some shooters may prefer having one.
- Shorter barrel = lower velocity: The reduced barrel length can lower the ballistic velocity.
Who Should Buy OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly?
This upper receiver assembly is perfect for anyone looking to build a compact and reliable AR-9 pistol for home defense, range fun, or competition. It’s also a great option for those who appreciate the AR platform and want a pistol-caliber variant. Those interested in a PCC for a bug-out bag or truck gun should also seriously consider this.
This may not be the right choice for those prioritizing long-range accuracy or maximum muzzle velocity. It is specifically designed for close-quarters engagements. Also, this is not a complete firearm and requires a compatible lower receiver, magazine, and other components to function.
Conclusion on OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly
The OpticsPlanet Exclusive Moriarti AR-9 4.5in 9mm Luger Upper Receiver Assembly offers an excellent value proposition for those seeking a compact and reliable AR-9 pistol. Its combination of solid construction, reliable performance, and affordable price makes it a compelling option in the crowded AR-9 market. I believe the price is justified based on my positive experience with the product.
I would definitely recommend it to anyone looking to build a dedicated home defense or range toy AR-9. If you’re ready to join the AR-9 revolution, this Moriarti upper is a great place to start. Grab yours today and experience the fun and versatility of the 9mm AR platform.