New for 2019 the Pac-Lite TSS� is an integrally suppressed upper for the Ruger� Mark I Mark II Mark III and 22/45� series pistols. At only 11 ounces the Pac-Lite TSS� features an aluminum upper titanium baffles stainless steel split tube that is lightweight accurate and durable. Installation on your existing frame is simple without the need of gunsmithing. - Specs: - Weight: 11 oz - Twist: 1-16 - Bore Length: 3.50� Inches [ 12.75� OVERALL ] - Green Fiber Optic Front Sight