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: 6.2 oz – Twist: 1-16 – Threads: 1/2×28 – Matte Black Fluted – *Drilled and tapped for Pac-Lite™ Scope Bases – *Thread Protector (End Cap) Included with Barrel