Manufacturer: TacSol ( Tactical Solutions ) Item: PAC-LITE IV Pistol Barrel SKU: PLIV45TEGMGRF Caliber: .22 Long Rifle Barrel Length: 4.5 ” Threaded ? X 28 Fluted Sights: Front Ramp, Rear Adjustable Drilled and Tapped for the Addition of an Optic Rail Finish: Gun Metal Gray The Tactical Solutions? PAC-LITE IV pistol barrel is a lightweight and accurate .22 LR barrel and receiver for the Ruger Mark IV or Mark IV 22/45 barrel. The PAC-LITE IV upgrade represents what TacSol is known for in the .22LR aftermarket barrel industry; lightweight, highly accurate, and easy-to-install barrels. This barrel dramatically increases accuracy, performance, and reliability. The 1? outside diameter of the threaded barrel is designed to shoot and look great with or without attachment of a suppressor or compensator. Suppressors are easily attached by simply twisting them on the barrel?s threaded end. Hand-chambered for 22 LR, with a target crown and chromoly bore, the PAC-LITE replacement barrel upgrade is everything you could ask for in a pistol barrel.