The Tactical Solutions PAC-LITE pistol barrel is a lightweight and accurate .22 LR barrel and receiver for the Ruger Mark IV or Mark IV 22/45 pistol. The Pac-Lite 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 barrels 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.