Forums › Forums › General Discussion › CTR 20" 260REM › Re: Re: CTR 20″ 260REM beastieboy78 Member May 31, 2016 at 3:43 am 1 Bullseye The outside diameter of my CTR barrel is a little over 20 mm or .82 of an inch. This measurement was taken 1 inch from the muzzle threads.
