UXR 300BLK, 14.5

UXR 300BLK, 14.5" barrel w/ FRC Comp (pin/weld)

UXR Conversion Kit .223 Wylde, 14.5

UXR Conversion Kit .223 Wylde, 14.5" barrel

UXR .308 Win, 16" barrel w/ FRC Comp


Introducing the PWS UXR in 308 WIN – a groundbreaking advancement in contemporary firearms. A true catalyst for change, the UXR seamlessly marries innovation with adaptability, echoing the wisdom of "beware of the man with only one rifle." Drawing inspiration from diverse influences, this rifle is not just a firearm; it's a dynamic platform poised to evolve and expand in response to the ever-changing demands of firearms technology.

Highlighted Features

  • Barrel Xchange System: An innovative barrel exchange system enabling users to switch between calibers and barrel lengths seamlessly such as .223 Wylde, 308 WIN, and 300 BLK, with new options coming in the future.
  • Modified Long Stroke Piston System: Renowned for reliability and reduced fouling, the UXR retains a similar long-stroke piston system like other legacy PWS products, but improved upon and engineered specifically for the UXR.
  • Bore Evacuator: The innovative bore evacuator ensures superior safety and performance by efficiently directing propellant gases away from the shooter and down the barrel.
  • Precision-Engineered Ambidextrous Receiver: Crafted from a single piece of 7075-T651 aluminum and hard anodized type III Class 2 Mil-Spec 8625 coating for durability, the ambidextrous receiver ensures a rigid platform.
  • Ambidextrous buttstock: Folding buttstock with cheek and length of pull adjustments. Configurable to either left or right-side folding. Mounted using an industry standard 1913 picatinny rail attached to the trigger housing.
  • Adjustable Gas System: 3-position adjustable gas system including a dedicated suppressor setting.
  • 308 WIN Chambering: Meticulously designed for outstanding accuracy and reliability for 308 WIN ammunition.
  • PWS FRC Compensator: A newly introduced compensator contributing to superior recoil management and reduced muzzle rise, enhancing overall shooter control.
  • MLOK Handguard: Fitted with a MLOK handguard that can be switched out for shorter lengths depending on the barrel and caliber used.
  • 41V50 1/10 Twist Barrel: The rifle features a 41V50 steel barrel with a 1/10 twist rate, striking a harmonious balance between durability and maneuverability, ensuring consistent and accurate shot placement.
  • Lightweight: standard configuration weight starts at 6.8 lbs

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Availability: Out of stock


UXR Modified Long-Stroke Piston System

Elevate your shooting experience with the groundbreaking UXR, a marvel of firearm engineering that seamlessly marries revolutionary technology with time-tested excellence. Witness the prowess of the Modified Long Stroke Piston System, a hallmark of reliability and reduced fouling that sets the UXR apart. This innovative platform inherits the legacy of PWS products but is finely tuned and engineered specifically for the UXR, ensuring unparalleled performance and reliability. Typical pistons use a tap-it or short stroke that strikes the carrier and moves it ½”, and relies on the inertia strike to complete the cycle. The UXR uses a modified long stroke where we gave a 1” shove to the carrier completing the camming process and moving the carrier rearward with less recoil impulse. 

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. 

The XChange System

The PWS UXR revolutionizes the firearms landscape with its innovative XChange system, empowering users to seamlessly adapt their rifle to meet diverse needs. This groundbreaking system enables a swift caliber change by simply switching the barrel, magwell, and bolt. The UXR launches with available chamberings in .223 Wylde, 300 BLK, and 308 WIN, offering users the flexibility to tailor their rifle to specific requirements. Unlike other modular rifles in the market, the UXR is committed to accessibility; caliber exchange kits are priced reasonably and readily available, ensuring that users can unlock the full potential of their rifle without breaking the bank. As the UXR expands its caliber offerings and barrel lengths in the future, it promises a level of versatility that transforms the shooting experience, setting a new standard for modular rifle platforms.

The PWS UXR introduces an intuitive and user-friendly dot system, simplifying the process of changing calibers. Each UXR component, including the magwell and bolt, is marked with corresponding dots to ensure seamless and error-free transformations while barrels are marked with their caliber and twist rate. For instance, transitioning a .223 Wylde UXR to a 308 WIN involves matching a single dot on the magwell with a single dot on the bolt, both indicating compatibility with the selected caliber as well as selecting the barrel with the 308 WIN 1:10 written clearly along the side. This precision-engineered dot system enhances the user experience, guaranteeing a hassle-free and reliable method for customizing the UXR to meet specific shooting needs.

XCHANGE Magazine Well

The UXR XChange Ambidextrous Magwell delivers exceptional functionality for shooters of all orientations, catering to both left and right-handed individuals. This magwell is equipped with a generously sized, ambidextrous magazine release button, guaranteeing efficient and easily accessible operation from either side of the rifle. Additionally, the ambidextrous bolt catch/release mechanism facilitates rapid and single-handed manipulation, enhancing overall ease of use.


The UXR Bore Evacuation System

Uniquely equipped with a cutting-edge bore evacuator system inspired by battle-tested armored vehicles, the UXR ensures a shooting experience like no other. This ingenious system efficiently clears propellant gases and airborne residues from the barrel, not only keeping gases away from the shooter but also making it an ideal choice for suppressor use. The UXR's commitment to safety and functionality shines through, providing users with a modern and adaptable firearm that seamlessly integrates proven technology to deliver optimal performance in various shooting scenarios. Elevate your shooting experience with the UXR Rifle, where innovation and safety converge for a truly exceptional firearm.

What is a bore evacuator?

The UXR stands out with its innovative inclusion of a bore evacuator, a feature derived from the technology commonly found in armored fighting vehicles, particularly tanks and self-propelled guns. This bore evacuator serves a crucial role by swiftly clearing the gun barrel of lingering gases and airborne residues after each firing, providing a significant enhancement to both safety and functionality.

In armored vehicles, the bore evacuator creates a pressure differential in the barrel, ensuring that propellant gases and combustion residues exit through the muzzle, preventing any potential hazard to the gun crew when the breech opens for reloading. The UXR's bore evacuator, inspired by this battle-tested concept, is a passive device featuring a ring of drilled holes and a cylindrical pressure reservoir sealed to the barrel's surface via a taper lock.

In the firing process, high-pressure gas propels the projectile forward, and the drilled holes enable propellant gases to flow into the reservoir. As the projectile exits the barrel, the pressure drop triggers the stored gas in the reservoir to flow back, utilizing the venturi effect to efficiently draw gases out of the barrel. This ingenious design, seamlessly integrated into the UXR, ensures the effective removal of gases, significantly reducing the risk of hazards associated with backward gas flow.

Enhancements to the basic concept in some designs include dual sets of holes—one forward and one rearward—equipped with check valves to control gas flow. This sophisticated system aids extraction by creating a partial vacuum behind the shell.

Why use it on the UXR?

The UXR Rifle's integration of a bore evacuator is particularly effective for firearms with semi-automatic or fully automatic actions. The UXR, embodying a commitment to innovation and safety, benefits from this technology, reducing the chances of explosive propellant gases flowing back into the rifle during the recoil process. This not only contributes to safety but also enhances the rifle's overall functionality.

As a modern and versatile firearm, the UXR Rifle exemplifies its dedication to incorporating battle-tested features for optimal performance. The inclusion of the bore evacuator is a testament to the UXR's commitment to both safety and innovation, making it a reliable and cutting-edge choice for discerning firearm enthusiasts in various shooting scenarios.

Ambidextrous Receiver

At the heart of the UXR rifle, a testament to precision engineering unfolds with the meticulously crafted ambidextrous receiver. This single-piece marvel stands as the keystone of the entire XChange platform, symbolizing a commitment to excellence. Forged from 7075-T651 aluminum, renowned for its strength and durability, the receiver undergoes a meticulous anodizing process, further enhancing its resilience. Beyond being a core structural component, this ambidextrous receiver is the serialized nucleus of the rifle, establishing the foundation for the UXR's adaptability and performance consistency. The ambidextrous design not only caters to the needs of both left and right-handed shooters but also reflects a dedication to user-friendly versatility. In every detail, from its construction to its functionality, the ambidextrous receiver embodies the ethos of the UXR—a platform that prioritizes quality, durability, and innovative design at its very core.

Ambidextrous Trigger Housing

The UXR stands out with its innovative ambidextrous trigger housing, incorporating a range of features designed for maximum adaptability and convenience. It is complemented by a 50-degree travel ambidextrous safety selector, allowing quick and intuitive fire selector changes. The pistol grip on the UXR is customizable and modular, accepting standard AR-15 pistol grips, allowing users to tailor their grip preferences. The ambidextrous folding buttstock seamlessly attaches to this trigger housing, providing a cohesive and adaptable platform for users who prioritize versatility and ease of use.

The PWS UXR is equipped with a custom TriggerTech 2.5 lbs - 5 lb. adjustable single-stage trigger, a deliberate choice tailored to enhance the firearm's overall performance. A single-stage trigger, characterized by its seamless and consistent pull until the break point, aligns perfectly with the UXR's design philosophy. This trigger configuration offers shooters a straightforward and rapid trigger response, making it ideal for dynamic shooting scenarios where quick and precise shots are essential.

The UXR is built with compatibility in mind and most mil-spec drop-in AR15 triggers will work in the rifle. Allowing you to truly customize your rifle in the way that fits your shooting needs.

Why a single-stage trigger?

A single-stage trigger is a preferred choice for many shooters seeking simplicity, speed, and immediate trigger response in their AR-15. Unlike two-stage triggers, which have a noticeable take-up before breaking, a single-stage trigger offers a consistent pull from start to break, eliminating any extra stages in the process. This design is particularly advantageous for dynamic shooting scenarios, where rapid and precise shots are crucial. Shooters appreciate the straightforward nature of a single-stage trigger, as it allows for quick follow-up shots and enhanced control in fast-paced situations. The PWS UXR's adoption of a single-stage trigger reflects a commitment to providing a responsive and user-friendly platform, making it an ideal choice for those who prioritize simplicity and swift trigger action in their shooting experiences.

The TriggerTech drop in Trigger

The custom TriggerTech AR15 Single-Stage drop-in AR trigger sets a new standard with its genuine zero-creep break, minimal overtravel, and an ultra-short sub 0.030” tactical reset, delivering exceptional reliability even in the harshest conditions. Featuring CLKR Technology™, the pull weight can be easily adjusted in precise 2oz increments with the trigger installed, providing shooters with quick and confident customization. With true zero creep, users often perceive the pull weights as approximately 0.5lbs lighter than friction-based triggers of the same measured pull weight, ensuring consistent and dependable performance. The incorporation of Zero Creep Technology™ and robust 440C stainless steel internal components not only offers corrosion resistance but also extends the trigger's service life. By eliminating the need for coating, polishing, or lubricating key engagement surfaces, this technology ensures unparalleled consistency in trigger pulls from shot to shot, even after thousands of rounds.

Ambidextrous Folding Stock

The UXR stock stands out with its ambidextrous folding design, allowing for both left and right-side folding to accommodate diverse user preferences. This buttstock features essential adjustments, including a cheek riser and length of pull customization. The addition of a cheek riser proves invaluable, providing shooters with the flexibility to mount a wide variety of scopes and optics, ensuring a comfortable and precise sight picture. The adjustable length of pull ensures that the rifle can be tailored to fit nearly any shooter, enhancing overall comfort and control. By utilizing an industry-standard 1913 picatinny rail attached to the trigger housing, the UXR stock not only ensures compatibility with various accessories but also underscores its commitment to providing a modular platform that meets the specific needs of individual users.

Additionally, the UXR's ambidextrous folding stock not only enhances shooting comfort but also provides unparalleled versatility in storage and transportation. The folding mechanism facilitates a more compact profile, making it easier to carry and store the rifle when not in use, especially in shorter barrel configurations. This adaptability ensures that the UXR remains a convenient and portable firearm, ready for deployment in various scenarios. Whether navigating challenging terrain, transporting in a vehicle, or storing in a limited space, the UXR's stock configuration allows users to maintain flexibility without compromising on functionality.

Modular Handguard

The UXR Modular Handguard offers unparalleled versatility with its MLOK design, allowing users to effortlessly swap out handguards for different lengths tailored to specific barrel lengths and calibers. The user-friendly process involves simply popping out a pin and sliding the rail out, providing a hassle-free means of customization. This unique feature is advantageous for shooters switching between various calibers and barrel lengths, ensuring adaptability to diverse shooting scenarios. The ability to customize the handguard not only enhances the rifle's aesthetics but also reflects the UXR's commitment to being fully modifiable, catering to the individual needs and preferences of the user.

308 WIN

308 WIN, also known as 7.62x51mm NATO, is a popular and versatile rifle cartridge that has stood the test of time. Originally developed for military use, it has seamlessly transitioned into the civilian realm, becoming a favorite among shooters for various applications. The cartridge features a shorter case length compared to its military counterpart, the 7.62 NATO, making it a reliable choice for modern sporting rifles.

What makes the 308 WIN great?

The .308 WIN cartridge, also known as 7.62x51mm NATO, stands as a time-tested and versatile choice for modern sporting rifles. With a shorter case length than its military counterpart, the 7.62 NATO, the .308 WIN offers enhanced compatibility with contemporary firearm platforms. Boasting a harmonious blend of power and versatility, this cartridge is favored by shooters engaging in various activities. Its moderate recoil, combined with substantial stopping power, caters to a wide range of shooting preferences, from precision long-range engagements to dynamic scenarios. Renowned for inherent accuracy, the .308 WIN is a favorite among marksmen seeking consistent performance at extended distances. Additionally, its effectiveness in big game hunting scenarios, affordability, and widespread availability contribute to making it a practical and economical choice for enthusiasts using modern sporting rifles. Whether at the range, in competition, or in the field, the .308 WIN remains a solid and dependable option for those desiring a versatile and effective cartridge for their firearms.

The UXR Barrel

The 16.1" barrel featured in the UXR exemplifies PWS's unwavering commitment to top-notch performance through the use of 41V50 steel. Renowned for its high-quality chromium-molybdenum-vanadium alloy composition, 41V50 steel boasts exceptional strength, toughness, and resistance to wear and heat. This premium steel choice reflects our dedication to producing barrels capable of withstanding rigorous use while maintaining accuracy.

The selection of 41V50 steel ensures a harmonious balance between durability and maneuverability, contributing to the barrel's longevity in various shooting scenarios. Whether engaged in tactical operations or recreational shooting, users can trust the durability of 41V50 steel to meet the demands of their chosen activities.

Highlighting our commitment to quality, all barrels are meticulously manufactured in-house, showcasing our meticulous control over the production process. This level of oversight enables us to uphold stringent quality standards, ensuring each barrel meets rigid specifications for accuracy, reliability, and overall performance. Ultimately, the combination of 41V50 steel and in-house manufacturing reflects our dedication to providing shooters with barrels that consistently deliver exceptional performance and durability, establishing them as a trusted choice for discerning firearm enthusiasts.

Understanding Twist Rate

Twist rate refers to the rate of rotation a barrel imparts to a projectile as it travels through. It's expressed as a ratio, indicating how many inches the bullet must travel to complete one full rotation. For example, a 1:10 twist rate means the bullet completes one full rotation every 10 inches of barrel travel. Twist rate plays a crucial role in stabilizing the projectile, ensuring it flies accurately and efficiently.

The primary function of the twist rate is to stabilize the bullet in flight. Stability is achieved by preventing the bullet from tumbling or veering off course. Different bullet weights and lengths perform optimally with specific twist rates. Too slow of a twist can result in insufficient stabilization, leading to accuracy issues, while too fast of a twist may overstabilize lighter bullets, impacting their performance.

The 1/10 Twist Rate

For the .308 WIN cartridge, a 1/10 twist rate is often regarded as optimal, striking a balance between stabilizing a variety of bullet weights and maximizing accuracy. A 1/10 twist rate implies that the bullet completes one full rotation for every 10 inches of barrel travel.

Key Advantages of 1/10 Twist

  • Versatility Across Bullet Weights: Accommodates a broad range of bullet weights, providing versatility in ammunition selection.
  • Harmonious Stabilization: Strikes a balance between stabilizing lighter and heavier projectiles, ensuring optimal performance without over-stabilization.
  • Consistent Accuracy: Delivers reliable and consistent accuracy across various shooting applications, including precision shooting, dynamic scenarios, and hunting.
  • Adaptability: Well-suited for diverse shooting scenarios, making it a versatile choice for modern sporting rifles chambered in .308 WIN.
  • Effective Performance: Maximizes the potential of .308 WIN ammunition, offering shooters an optimal twist rate for enhanced stability and accuracy.


Enhance your shooting prowess with the innovative PWS FRC compensator, a premier selection for a diverse range of shooting scenarios. This compensator sets itself apart by prioritizing recoil reduction as its primary function while simultaneously excelling at flash suppression. Its distinctive port designs skillfully redirect flash away from optics and the line of sight, ensuring an unobstructed view and minimizing overpressure. The precisely mounted FRC stands as a crucial component in the UXR rifle's comprehensive recoil management system. By effectively mitigating recoil and muzzle rise, this compensator enables swift follow-up shots, ultimately delivering improved shooter control. Choosing the PWS FRC provides the best of both worlds—superior recoil management and effective flash suppression—making it a preferred option among discerning UXR enthusiasts. Elevate your shooting experience with this cutting-edge compensator.

Why the tapered muzzle shoulder?

The meticulously engineered tapered muzzle shoulder of the UXR rifle, tailored for tapered muzzle devices like the PWS FRC, represents a pivotal advancement in firearm technology. This design optimizes alignment, enhances accessory locking, and substantially improves accuracy while eliminating the need for additional shims. Beyond its role in improving accuracy and reducing point-of-impact shift, the tapered muzzle shoulder plays a crucial role in elevating suppressor mounting on Modern Sporting Rifles. The precise mating surface offered by the tapered design ensures a secure and consistent connection between the barrel and suppressor, eliminating potential misalignments that could compromise suppressor performance. This not only prevents issues like baffle strikes but also ensures a stable and repeatable connection, contributing to the overall effectiveness of the suppressor in mitigating recoil and muzzle rise. Prioritizing alignment and accessory lock with a tapered muzzle shoulder not only maintains the rifle's accuracy but also optimizes suppressor performance, providing a reliable and enjoyable shooting experience for firearm enthusiasts.

Using non-tapered muzzle devices on the UXR.

Encountering the challenge of needing a different muzzle device on a barrel with a tapered muzzle shoulder? A taper adapter serves as a versatile solution, allowing you to convert your 1/2-28 or 5/8-24 muzzle to a traditional 90°, non-scientific shoulder. Whether you're utilizing silencers that require a 90° square shoulder or using a muzzle brake with shim requirements, a taper adapter provides compatibility and versatility for your MSR, ensuring straightforward solutions for various muzzle device preferences.

Which muzzle device is the best for you?

Compensator: A compensator is designed to mitigate recoil and muzzle rise, enhancing overall shooter control. It achieves this by directing gases in specific directions to counteract the natural upward movement of the firearm during firing. While compensators can have secondary functions, such as flash suppression, their primary goal is recoil management. The PWS FSC compensator, for example, excels in reducing recoil and features unique port designs to keep flash away from optics and the line of sight.

Flash Hider: A flash hider is primarily designed to minimize the visible muzzle flash that occurs during firing. It disperses the burning gases produced by the ignited gunpowder, reducing the intensity of the flash. Flash hiders are valuable for maintaining shooter visibility in low-light conditions and for preventing temporary visual impairment that can occur with larger-caliber firearms. However, they don't provide significant recoil reduction.

Muzzle Brake: A muzzle brake, like a compensator, is focused on recoil reduction and muzzle rise control. It achieves this by redirecting gases to counteract the firearm's natural movement during firing. Muzzle brakes are effective in reducing felt recoil but may produce more noticeable side blast and increased noise compared to compensators. They typically do not offer flash suppression as a primary feature.

UXR External Breakdown

UXR Internal Breakdown

The UXR exemplifies the continual progression of firearm design, harmoniously blending state-of-the-art innovations with proven principles to deliver shooters an exceptional and versatile platform. Delve into the intricate details below, highlighting the key technological components that set the UXR apart.

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What Could You Do With Your PWS UXR

Shown with aftermarket parts and accessories to fully max out your PWS UXR's Potential

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UXR Manual

UXR Manual