Primary Weapons Systems UXR Elite .300 AAC Blackout Semi-Auto, Black The proprietary UXR or User XChange Rifle, represents the pinnacle of firearm innovation, delivering unmatched modularity and performance. Designed for adaptability, its patent-pending XCHANGE system enables shooters to effortlessly switch between calibers on the same serialized platform by exchanging just three components: the magazine well, bolt head and barrel. Engineered for superior shooting dynamics, the UXR incorporates a unique bore-evacuation chamber within the barrel and a modified long-stroke piston system, working together to reduce recoil and create an exceptionally smooth shooting experience. Whether engaging in long-range precision shooting or navigating fast-paced tactical scenarios, the UXR stands as the ultimate fusion of versatility, reliability and cutting-edge performance. Features a 14.5 Inches pinned and welded barrel, ensuring compliance with legal barrel length requirements while maintaining a compact design The FRC compensator reduces muzzle rise and recoil for improved shooting stability and accuracy M-LOK free-float handguard provides superior modularity for accessory mounting and improved heat dissipation Modified long stroke piston system enhances reliability and reduces fouling for consistent performance