The Rigby Peep Sight is an excellent custom feature for an open-sight rifle. Although originally intended for Mauser-98 style guns, an adapter is available to accommodate most bolt-actions. The longer sight radius provides for greater accuracy, and quick sight placement on target is advantageous for dangerous game. Sight height from center line of dovetail to center line of peep hole is .935″ in downward position. The peep stem has a range of motion of .365″ and peep hole diameter is .068″ but can be enlarged upon request. Please check out the product review by Lee Helgeland in the Summer 2016 issue of Gunmaker Journal of Custom Gunmaking.