PWS MK116 MOD 2-M UPPER 16.1″ Black Review

The PWS MK116 MOD 2-M UPPER 16.1″ Black Made a Bold First Impression

For years, I’ve built AR platforms, tweaking every component to extract maximum performance and reliability. But the PWS MK116 MOD 2-M UPPER 16.1″ Black promised something different: a factory-built, long-stroke piston system that eliminated the tinkering from the equation. The allure of a cleaner, smoother-running AR, straight out of the box, was too much to resist.

I was searching for an upper receiver that provided exceptional reliability and consistent performance under a variety of conditions. I wanted a system that could handle both suppressed and unsuppressed fire without requiring constant adjustments. The PWS MK116 MOD 2-M UPPER 16.1″ Black, with its adjustable gas system, seemed to be the perfect solution.

Upon unboxing, the PWS MK116 MOD 2-M UPPER 16.1″ Black exuded quality. The anodized finish was flawless, and the fit and finish were impeccable, making it clear that Primary Weapons Systems (PWS) doesn’t cut corners. The weight felt balanced, and the included Radian Raptor charging handle was a welcome touch.

I considered options from Bravo Company Manufacturing (BCM) and Daniel Defense, both known for their DI (direct impingement) systems. However, the piston-driven design of the PWS MK116 MOD 2-M UPPER 16.1″ Black was the deciding factor, promising reduced carbon fouling and enhanced reliability. Ultimately, the PWS system’s reputation for durability and smoother operation won me over.

My initial impression was one of excitement tempered with cautious optimism. I knew that piston systems could be finicky if not properly engineered. However, the reputation of PWS and the obvious quality of the components left me eager to put the MK116 MOD 2-M through its paces.

Real-World Testing: Putting PWS MK116 MOD 2-M UPPER 16.1″ Black to the Test

First Use Experience

My first outing with the PWS MK116 MOD 2-M UPPER 16.1″ Black was at my local range, a dusty outdoor facility known for its challenging conditions. I mounted the upper on a mil-spec lower receiver and paired it with a reliable optic. From the first shot, the difference between this piston system and my typical DI ARs was noticeable.

The recoil impulse was noticeably smoother, and the rifle stayed on target with minimal muzzle rise. I ran several magazines through it using both 5.56 NATO and .223 Remington ammunition. The rifle cycled flawlessly, with no malfunctions of any kind.

I encountered no major issues during the first use, but the gas adjustment dial was initially stiff. I adjusted the gas setting to accommodate both suppressed and unsuppressed fire, and it took a bit of effort to rotate the selector. After a few adjustments, the dial became easier to manipulate, but it’s something to be aware of.

Extended Use & Reliability

After several months of regular use, the PWS MK116 MOD 2-M UPPER 16.1″ Black has proven to be exceptionally reliable. I’ve put hundreds of rounds through it in various conditions, including a rainy weekend training course and several dusty range sessions. The rifle has continued to perform flawlessly.

The PWS upper has held up remarkably well. The anodized finish shows minimal wear, even after being subjected to the rigors of training and competition. The barrel remains accurate, and the piston system continues to function smoothly.

Maintaining the MK116 MOD 2-M is noticeably easier than maintaining a DI AR. Cleaning the piston components takes only a few minutes, and there is significantly less carbon fouling in the receiver. This ease of maintenance has saved me time and effort, making it a welcome change from my previous experiences.

Compared to my previous DI AR setups, the PWS MK116 MOD 2-M is a clear upgrade in terms of reliability and ease of maintenance. The smoother recoil impulse and consistent performance under varying conditions have also impressed me. It has exceeded my expectations.

Breaking Down the Features of PWS MK116 MOD 2-M UPPER 16.1″ Black

Specifications

The PWS MK116 MOD 2-M UPPER 16.1″ Black boasts impressive specifications, designed for optimal performance and reliability. It is chambered in .223 Wylde, allowing it to safely and accurately fire both 5.56 NATO and .223 Remington ammunition.

The barrel is 16.1 inches long with a 1:8″ twist rate, providing excellent stability for a wide range of bullet weights. It features an FSC 556 muzzle device, which effectively reduces muzzle flash and felt recoil. The upper receiver is forged from T6 7075 aluminum with a hard coat anodized finish, ensuring exceptional durability and resistance to corrosion.

This upper receiver utilizes the PWS long-stroke piston system, known for its reliability and cleaner operation compared to direct impingement systems. It includes a 3-setting adjustable gas regulator, allowing users to tune the rifle for different ammunition types and suppressed or unsuppressed use. The 15″ PWS PicLok MLOK handguard provides ample space for mounting accessories and is compatible with both Picatinny and M-LOK attachments.

The specifications of the PWS MK116 MOD 2-M are crucial for its performance because they directly impact its accuracy, reliability, and adaptability. The .223 Wylde chamber ensures versatility, while the 1:8″ twist rate optimizes performance with various bullet weights. The long-stroke piston system contributes to smoother operation and reduced carbon fouling, while the adjustable gas regulator allows users to fine-tune the rifle for specific needs.

Performance & Functionality

The PWS MK116 MOD 2-M UPPER 16.1″ Black excels in its primary function: delivering consistent and reliable performance in a variety of conditions. Its accuracy is impressive, easily achieving sub-MOA groupings with quality ammunition. The rifle cycles smoothly and consistently, regardless of ammunition type or environmental factors.

The main strength of the PWS MK116 MOD 2-M lies in its reliability. The piston system minimizes carbon fouling and keeps the action running cleaner for longer, reducing the likelihood of malfunctions. The adjustable gas system is a valuable feature, allowing users to optimize the rifle for different conditions, but the gas adjustment dial may require some initial effort to manipulate.

The PWS MK116 MOD 2-M has met and exceeded my expectations in terms of performance and reliability. The smooth recoil impulse, consistent cycling, and reduced maintenance requirements have made it a standout performer in my collection. It has proven to be a reliable and accurate platform for a variety of shooting applications.

Design & Ergonomics

The PWS MK116 MOD 2-M UPPER 16.1″ Black features a well-thought-out design that prioritizes both aesthetics and functionality. The materials used are of high quality, contributing to the overall durability and feel of the upper receiver. The weight is balanced, making the rifle comfortable to handle and shoot.

The PWS MK116 MOD 2-M is user-friendly. The inclusion of the Radian Raptor charging handle is a welcome touch, providing ambidextrous functionality and improved ergonomics. The PicLok handguard offers ample space for mounting accessories and is compatible with both Picatinny and M-LOK attachments, enhancing its versatility.

Durability & Maintenance

The PWS MK116 MOD 2-M UPPER 16.1″ Black is built to last, thanks to its high-quality materials and robust construction. With proper care and maintenance, it should provide many years of reliable service. The anodized finish is resistant to scratches and corrosion, protecting the underlying aluminum from the elements.

The PWS MK116 MOD 2-M is relatively easy to maintain and repair, thanks to its simple and straightforward design. Cleaning the piston system is much easier than cleaning a direct impingement system, reducing the time and effort required for routine maintenance. Spare parts are readily available from Primary Weapons Systems and other retailers, making repairs relatively simple.

Accessories and Customization Options

The PWS MK116 MOD 2-M UPPER 16.1″ Black comes with a Radian Raptor ambidextrous charging handle, a high-quality component that enhances the rifle’s ergonomics and functionality. The 15″ PWS PicLok MLOK handguard provides ample space for mounting accessories such as lights, lasers, and forward grips.

The PWS MK116 MOD 2-M is compatible with a wide range of AR-15 accessories from various brands. It readily accepts aftermarket optics, including red dot sights, holographic sights, and magnified scopes. The handguard is compatible with M-LOK rail segments and other accessories, allowing users to customize the rifle to their specific needs.

Pros and Cons of PWS MK116 MOD 2-M UPPER 16.1″ Black

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Who Should Buy PWS MK116 MOD 2-M UPPER 16.1″ Black?

The PWS MK116 MOD 2-M UPPER 16.1″ Black is perfect for shooters who prioritize reliability, smooth operation, and ease of maintenance. This upper is ideal for law enforcement professionals, competitive shooters, and serious enthusiasts who demand consistent performance in challenging conditions. Anyone who values a cleaner running, more reliable AR platform will appreciate the benefits of the PWS piston system.

This product might not be the best choice for budget-conscious shooters or those who prefer the simplicity and lower cost of direct impingement systems. Shooters who enjoy tinkering with their rifles and swapping out parts frequently may also find the PWS MK116 MOD 2-M less appealing, as the piston system is less customizable than a DI setup.

A quality optic, such as an Aimpoint PRO or Trijicon MRO, is a must-have accessory for the PWS MK116 MOD 2-M. A weapon light, such as a SureFire Scout Light or Streamlight ProTac, is also highly recommended for low-light situations. A suppressor, when used in conjunction with the adjustable gas system, can further enhance the rifle’s performance and reduce noise.

Conclusion on PWS MK116 MOD 2-M UPPER 16.1″ Black

The PWS MK116 MOD 2-M UPPER 16.1″ Black is a premium AR-15 upper receiver that delivers exceptional performance, reliability, and ease of maintenance. Primary Weapons Systems has engineered a top-tier piston system that runs cleaner, smoother, and more consistently than traditional direct impingement designs. While the price point is higher, the benefits of reduced carbon fouling, smoother recoil, and enhanced reliability make it a worthwhile investment for serious shooters.

The price is justified by the quality of the components, the innovative design, and the enhanced performance it provides. This upper receiver is not just a collection of parts; it’s a carefully engineered system that delivers a superior shooting experience.

I wholeheartedly recommend the PWS MK116 MOD 2-M UPPER 16.1″ Black to anyone seeking a reliable, accurate, and easy-to-maintain AR-15 platform. If you value consistent performance and are willing to invest in quality, this upper receiver is an excellent choice. Upgrade your AR today and experience the difference that a PWS piston system can make!

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