MK118 MOD 1-M Upper .223 Wylde

MK118 MOD 1-M Upper .223 Wylde

Alpha LT Upper - Black

Alpha LT Upper - Black

MK118 MOD 2-M Upper .223 Wylde


The MK118 MOD 2-M Upper operates on the highly acclaimed PWS Long Stroke Piston System, renowned for its reliability and reduced fouling. The inclusion of a 3-setting Adjustable Gas System allows users to fine-tune gas flow, ensuring optimal performance in diverse shooting conditions as well as optimizing it for suppressor use. This innovative system not only enhances reliability but also provides adaptability to various ammunition types and environmental factors.

Highlighted Features

  • PWS Long Stroke Piston System: Renowned for reliability and reduced fouling, with adjustable gas settings for optimal performance.

  • Suppressor Optimized: Provides enhanced suppressor performance by minimizing back pressure, reducing gas blowback, and optimizing gas flow for a cleaner and more comfortable shooting experience.

  • Upper Receiver:  Crafted from 7075-T651 aluminum and finished with Mil-Spec Type III Class 2 Hard Coat Anodize, the Upper Receiver boasts PWS's proprietary piston design for optimal durability and reliability.

  • .223 Wylde Chambering: Meticulously designed for outstanding accuracy and reliability, accommodating both .223 Remington and 5.56mm NATO.

  • Innovative PicLok™ Handguard: Combining both Picatinny and MLOK into one for mounting accessories, balancing ergonomics and functionality.

  • Radian Raptor™ Ambidextrous Charging Handle: Ensures smooth operation for both left and right-handed shooters.

Availability: In stock


PWS Long-Stroke Piston System

The MK118 MOD 2-M Upper operates on the highly acclaimed PWS Long Stroke Piston System, renowned for its reliability and reduced fouling. The inclusion of a 3-setting Adjustable Gas System allows users to fine-tune gas flow, ensuring optimal performance in diverse shooting conditions. This innovative system not only enhances reliability but also provides adaptability to various ammunition types and environmental factors.

Why Use the Long-Stroke Piston System?

Opting for a Primary Weapons Systems gas piston system over a traditional Direct Gas Impingement (DI) system on an AR-15 can be motivated by several advantages, particularly in terms of safety, cleanliness, and performance, especially when considering the use of a suppressor. Here are key reasons why you might want to choose a PWS gas piston system:

  • Reduced Gas Blowback: In a piston-operated system, like the one offered by PWS, the gas is not directed back into the upper receiver, minimizing gas blowback towards the shooter's face. This design enhances the overall shooting experience, particularly for those who prioritize a cleaner and more comfortable shooting environment.
  • Enhanced Reliability: The piston system typically provides enhanced reliability, especially in adverse conditions or when the rifle becomes dirty. Since the operating components are not exposed to the combustion gases to the same extent as in a DI system, there's less chance of fouling affecting the rifle's function. This can be a critical factor for users who require consistent performance in various environments.
  • Cooler Operating Temperature: The piston system tends to keep the operating components cooler than a DI system, as the hot gases are vented away from the action. This can contribute to prolonged barrel and component life, reducing wear and potential heat-related issues during extended firing sessions.
  • Cleaner Action: PWS gas piston systems contribute to a cleaner overall firearm because the fouling from burnt powder and carbon is not directed into the receiver. This can result in less maintenance and easier cleaning, which is particularly beneficial for users who prefer spending more time shooting than cleaning.
  • Suppressor Use: When using a suppressor, a piston system is often preferred due to the reduced gas blowback and overall cleaner operation. Suppressors inherently increase backpressure, and a piston system helps mitigate this effect, providing a more pleasant shooting experience and minimizing the risk of gas and debris reaching the shooter's face.
  • Adjustable Gas Systems: Many piston systems, including PWS, come with adjustable gas settings. This feature allows users to fine-tune the gas flow to accommodate different ammunition loads, suppressor usage, or adverse environmental conditions. This level of adaptability is valuable for shooters seeking optimal performance under various circumstances. 

3-setting Adjustable Gas System

Allows the user to finely tune the weapon's gas flow in order to get maximum performance in diverse shooting conditions as well as optimizing for suppressor use.

Position 1

Position 1 is normal operation with standard and some military ammunition.

Position 2

Position 2 is for suppresser use with hotter loads such as military ammunition.

Position 3

Position 3 is for suppressed use when running standard ammunition.

PWS PicLok™

Introducing the MK118 MOD 2-M Upper, equipped with the revolutionary PWS PicLok™ 15.05” Handguard, showcasing our commitment to innovation and user customization. Crafted with dimensions of 1.7” width and 2.25” height, this handguard strikes an ideal balance between ergonomics and functionality, offering a comfortable and customizable grip for shooters.

The PicLok technology embedded in this handguard allows users to effortlessly mount Picatinny or MLOK accessories, enhancing the rifle's adaptability to individual preferences. We recognize the evolution of rifle rails with the advent of MLOK, and while our handguard embraces this modernization, we acknowledge that Picatinny rails still hold significant advantages. At PWS, we pride ourselves on providing a unique blend of innovation and tradition. While MLOK offers a streamlined and lightweight solution, the robustness and versatility of Picatinny rails are unmatched. Our handguard design combines the best of both worlds, ensuring our consumers benefit from the adaptability of MLOK alongside the time-tested advantages of Picatinny rails, setting PWS apart in offering a truly comprehensive and versatile rail system.

Chambered in 223 Wylde

Chambered in .223 Wylde, the MK118 MOD 2-M is meticulously designed to offer outstanding accuracy and reliability. This caliber choice allows shooters to seamlessly use both .223 Remington and 5.56mm NATO ammunition, providing versatility without compromising on performance.

Why 223 Wylde?

Choosing a rifle chambered in .223 Wylde offers the best of both worlds for consumers seeking versatility and optimal performance. Developed by Bill Wylde, this chamber design seamlessly accommodates both .223 Remington and 5.56mm NATO ammunition, providing users with a broader range of options. The .223 Wylde chamber resembles the .223 Remington externally but incorporates a slightly longer throat to handle the higher pressures associated with 5.56mm NATO rounds. This design not only ensures compatibility with both cartridge types but also enhances accuracy by accommodating longer, heavier bullets commonly used for precision shooting. In essence, opting for a rifle with a .223 Wylde chamber means enjoying the flexibility to use different types of ammunition without compromising on accuracy, making it an ideal choice for shooters looking for a versatile and high-performing firearm.

The MK118 Barrel

The use of 416SS steel in the construction of barrels, such as the 18" barrel featured in this rifle, underscores PWS's dedication to delivering unparalleled performance. 416SS is a premium stainless steel renowned for its outstanding strength, durability, and resistance to wear and heat. This choice of material not only ensures exceptional barrel longevity but also maintains accuracy under rigorous shooting conditions.

By opting for 416SS steel, we guarantee that our barrels strike a perfect balance between ruggedness and agility. This robust steel enhances the barrel's lifespan, making it ideal for a wide range of shooting applications. Whether engaged in tactical operations or recreational shooting, shooters can trust in the durability of 416SS steel to withstand the demands of their activities.

Furthermore, our commitment to quality extends beyond material selection, as all barrels are meticulously manufactured in-house. This hands-on approach enables us to maintain precise control over the production process, ensuring that each barrel meets our stringent standards for accuracy, reliability, and overall performance. Ultimately, the combination of 416SS steel and in-house manufacturing exemplifies our unwavering dedication to providing shooters with barrels that offer exceptional performance and durability, establishing them as a trusted choice for discerning firearm enthusiasts.

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