The XTR Xtreme Tactical rings were created specifically for the tactical shooter who puts a premium on less weight and plenty of holding power. From smaller carbines to the most powerful magnums XTR rings will stand up to years of use and recoil. They are also great for hunting rifles slug guns or muzzleloaders. - Available in both 1 and 30mm sizes and a choice of four ring heights Burris now offers Quick Detach (QD) models in 1 and 30mm in Medium and X-High. Standard Xtreme Tactical Rings will work with any Weaver or Picatinny- style bases while QD Rings will work with Pictanny-style bases and AR platforms. The extra-high 1 version is ideal for AR15/M16 flattop receivers where scope height is critical.