Pac-Lite Barrels for Ruger® Mark I, II, III™, and 22/45™ Convert your Ruger Mark I, II or III Pistol into a lightweight, easy packing tack driver with our new Pac-Lite "upper" barrel system. These threaded end barrels replace your factory barrel and receiver with lightweight anodized aluminum (the barrel is lined with precision button rifled steel). This Pac-lite barrel includes adjustable iron sights and a threaded muzzle with thread protector. Muzzle threaded 1/2x28 for suppressor or compensator. Please Note: Pac-Lite barrels are actually serial numbered uppers that require FFL transfer paperwork. When you order, download your dealer FFL or ask that dealer to FAX (320-834-3002) or email (firstname.lastname@example.org) a copy of their FFL to us (EABCO) along with your name and order number. We'll ship your Pac-Lite barrel to your dealer where you can go and pick it up. We are not able to ship this item to California or Washington D.C. - Ruger, Mk I, Mk II, Mk III, and 22/45 are trademarks of Sturm, Ruger & Co. Inc.