Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver Review

First Impressions of Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver

The Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver represents a significant step up in the AR-15 platform, combining the reliability of a long-stroke piston system with the hard-hitting 7.62x39mm cartridge. Primary Weapons Systems (PWS) has built a reputation for quality and innovation, and this upper receiver promises to deliver both in spades. I’ve been eager to explore its capabilities and see if it lives up to the hype.

I’ve always been drawn to the 7.62×39 cartridge for its proven stopping power and readily available ammunition. The AR platform, while versatile, typically necessitates direct impingement gas systems for this round, which can sometimes compromise reliability. A reliable 7.62×39 AR has always been a goal of mine.

Unboxing the upper receiver, the first thing that struck me was the solid feel and meticulous finish. The forged upper receiver exudes quality, and the PicLok handguard is sleek and modern. It feels substantial and well-built.

I considered the Brownells BRN-180 and the CMMG Mutant, both of which offer alternative operating systems for AR platforms. Ultimately, I chose the Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver for its proven long-stroke piston design and the reputation of PWS. This seemed like the most refined option.

My initial impression is one of excitement tempered with cautious optimism. The quality appears excellent, but the real test will be how it performs on the range. I am definitely eager to get out and shoot this thing!

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Real-World Testing: Putting Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver to the Test

First Use Experience

My first range trip with the Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver was a mixed bag of excitement and adjustment. I tested it at my local outdoor range in relatively mild conditions – sunny, about 70 degrees, with a slight breeze. The range provided distances out to 300 yards.

The upper receiver performed admirably in the dry conditions, exhibiting no malfunctions in the first 100 rounds. However, the gas system needed some tweaking with the included tool to find the sweet spot with the particular ammunition I was using. Finding the correct gas setting made a noticeable difference in recoil and cycling smoothness.

The initial break-in period required some fine-tuning of the gas system. It was something that had to be done, but once adjusted, this upper ran like a sewing machine.

Extended Use & Reliability

After several months and several hundred rounds, the Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver has proven to be remarkably reliable. I’ve used it in varying conditions, including a dusty range day and a light rain, and it has continued to function without issue. Cleaning is necessary of course.

The finish has held up well with only minor scuff marks on the handguard, which is to be expected. Disassembly and cleaning are straightforward, thanks to the simple design of the piston system. The piston requires less aggressive cleaning compared to a direct impingement system.

Previously, I’ve struggled with the reliability of other 7.62×39 AR builds. This PWS upper significantly outperforms them in terms of consistent cycling and reduced fouling. It has lived up to expectations and then some.

Breaking Down the Features of Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver

Specifications

• Manufacturer: Primary Weapons Systems. The brand is well-regarded for quality and innovation in AR-platform firearms.

• Caliber: 7.62x39mm. A potent cartridge offering good stopping power.

• Overall Length: 20.75 inches. Provides a good balance of maneuverability and ballistic performance.

• Barrel Length: 11.85 inches. A shorter barrel which is a nice size and is great for shorter range engagements.

• Gas System Length: Carbine Length. Optimized for the shorter barrel length to ensure proper cycling.

• Barrel Twist Rate: 1-10. Stabilizes the 7.62x39mm projectile effectively.

• Handguard Type: Free-Float. Improves accuracy by preventing pressure on the barrel.

• Muzzle Device: Triad30. Reduces felt recoil and muzzle rise.

• Color: Black. A standard and versatile finish.

• Fabric/Material: T6 7075 Aluminum. Provides strength and durability while keeping weight down.

• Handguard Length: 11.05 inches. Offers ample space for mounting accessories.

• Gun Rail: Pic-Lok. A hybrid system allowing for both Picatinny and MLOK attachment.

• Gas System Type: Long-Stroke Piston. Enhances reliability and reduces fouling in the receiver.

• Magazine Included: No. Requires separate purchase of 7.62×39 AR magazines.

These specifications combine to create a reliable and accurate upper receiver chambered in a hard-hitting cartridge. The long-stroke piston system is a key feature contributing to its reliability.

Performance & Functionality

The Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver performs its job exceptionally well, delivering accurate and reliable fire in the 7.62x39mm chambering. Accuracy is excellent for a short-barreled platform. Groupings at 100 yards with quality ammunition are consistently within 2 MOA.

The adjustable gas system is a huge plus, allowing you to fine-tune the rifle for different ammunition types and suppressors. The Triad30 compensator effectively reduces recoil, making follow-up shots faster and easier. The Radian Raptor Charging Handle is also a nice addition.

The only real weakness I’ve found is the proprietary nature of some of the PWS components, which might limit aftermarket customization. However, the performance and reliability more than compensate for this. This upper exceeds my expectations.

Design & Ergonomics

The build quality is outstanding. The forged upper receiver feels incredibly solid, and the finish is flawless. The weight is reasonable for a piston-driven system, providing a good balance without being overly heavy.

The ergonomics are excellent, thanks to the slim profile of the PicLok handguard and the comfortable Radian Raptor Charging Handle. The absence of a forward assist contributes to a cleaner aesthetic. It’s user-friendly with a minimal learning curve.

Durability & Maintenance

Based on my experience so far, the Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver is built to last. The high-quality materials and robust construction inspire confidence. Regular cleaning and lubrication are all that’s needed to keep it running smoothly.

The piston system runs cleaner than a direct impingement system, which simplifies maintenance. Parts replacement, should it ever be needed, appears to be relatively straightforward. The durability appears to be excellent.

Accessories and Customization Options

The PicLok handguard provides a versatile platform for mounting accessories, accepting both Picatinny and MLOK attachments. The Radian Raptor Charging Handle is a welcome upgrade over standard charging handles.

While some components are proprietary, the upper receiver is compatible with most standard AR-15 lower receivers and triggers. Common accessories like optics, lights, and slings can be easily added. Customization is limited to accessories attached to the PicLok rail.

Pros and Cons of Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver

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Who Should Buy Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver?

The Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver is perfect for those seeking a reliable and accurate 7.62x39mm AR platform. It is an excellent choice for hog hunters, those wanting an alternative to 5.56, and individuals prioritizing reliability and durability in their firearms. It is also well-suited for tactical applications.

Those who should skip this product are budget-conscious buyers or individuals who prioritize extensive aftermarket customization options. A quality optic and magazines are must-have accessories.

Conclusion on Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver

The Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver is a top-tier product that delivers exceptional performance and reliability. While the price is higher than some alternatives, the quality and functionality justify the investment. The quality is apparent.

I would wholeheartedly recommend this upper receiver to anyone looking for a premium 7.62x39mm AR platform. If you want a reliable, accurate, and durable upper receiver, look no further than the Primary Weapons Systems MK111 MOD 2-M 20.75in 7.62×39 Upper Receiver. Experience the PWS difference for yourself!