The Pac-Lite is the original go-to upgrade for tricking out your Ruger� Mark I Mark II Mark III and 22/45� series pistol. Crafted from a solid piece of aircraft aluminum the Pac-Lite provides an ultra strong and lightweight experience. - The improved balance and accuracy of the Pac-Lite makes shooters feel like a pro. Installation on your existing MK frame is a cinch without the need of a gunsmith. - Fully customizable the Pac-Lite offers enough colors options and accessories to please even the pickiest of shooters. - Specs: - Weight: 7.4 oz - Twist: 1-16 - Threads: 1/2x28 - Matte Black Fluted - *Drilled and tapped for Pac-Lite� Scope Bases - *Thread Protector (End Cap) Included with Barrel