Abstract: The following disclosure relates to a device for the securement of a sighting instrument within the bore of a shotgun in which the present device comprises: a main shaft; means for a spring-biased reciprocal movement which is axially secured about said shaft; a muzzle stopper having a partially cone-like contour including a circumferentially formed finger-grip therein, the stopper being axially secured about said spring-biased means such as to create a potential for hypodermic-like reciprocating movement of the stopper with respect to the main shaft; an end cone disposed at the end of the shaft opposite to that end proximate to the finger grip of the muzzle stopper; and three resilient ball-bearing rods, each having bearings at the same one end thereof, each of said rods situated about said shaft at 120.degree.