The Tactical Solutions PAC-LITE IV® TSS is the only integrally suppressed upper available for the Ruger® Mark IV and Mark IV 22/45 and includes a patent pending muzzle-end front sight system. At only 12 ounces this lightweight accurate integrally suppressed .22 LR pistol barrel features titanium interlocking baffles and a patented stainless steel split tube for easy service and cleaning. The barrel is engineered and manufactured with an internal silencer built into the barrel which allows the pistol barrel length to remain manageable and short compared to traditional barrels with screw-on silencers attached. The PAC-LITE IV TSS is easily installed on your Ruger pistol. – The only complete integrally suppressed Mark IV Upper/Barrel available! – Patent pending sight system! – Muzzle-end fiber optic front sight! – Patented easy removal of suppressor baffles for easy cleaning! – Lightweight for quick and easy target acquisition! – Highly accurate! – Quick and easy to install! – Specs: – Weight: 12 oz – Twist: 1-16 – Bore Length: 3.50 Inches [ 12.75 OVERALL ] – Green Fiber Optic Front Sight