Product Description The Walther Arms PDP 5.1" Threaded Polygon Barrel Kit (MPN: 2871998) is a precision-engineered upgrade for the Walther PDP platform. Chambered in 9mm and designed to fit PDP 4.5" frame models, this 5.1-inch threaded barrel extends sight radius and enhances suppressor compatibility right out of the box. The barrel features polygonal rifling for superior bore engagement, consistent accuracy, and improved durability compared to traditional land-and-groove rifling. Standard 1/2"-28 TPI muzzle threads allow the use of a wide range of suppressors, compensators, and muzzle devices. The complete kit includes the threaded barrel, recoil spring, and thread protector, providing everything needed for a straightforward, drop-in installation with no additional components required. Product Highlights Fits Walther PDP 4.5" frame models, offering a 5.1-inch barrel length for an extended sight radius and improved downrange performance Polygonal rifling delivers consistent accuracy, tight bore engagement, and enhanced barrel longevity across extended range sessions 1/2"-28 TPI muzzle threads provide immediate suppressor-ready versatility for tactical, competition, or personal defense configurations Complete kit includes the threaded barrel, recoil spring, and thread protector for a true plug-and-play installation experience Manufactured by Walther Arms to OEM specifications, ensuring reliable fit, function, and durability within the PDP platform Specs Brand: Walther Arms Caliber: 9mm Barrel Length: 5.1" Rifling Type: Polygonal Thread Pitch: 1/2"-28 TPI Compatible Models: Walther PDP 4.5" Kit Includes: Threaded Barrel, Recoil Spring, Thread Protector MPN: 2871998 UPC: 723364228469 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.