A firearm sight comprising a generally circular sight support ring surrounding and removably holding an optically clear generally circular lens, said lens having a cylindrical shape, front and back faces, a diameter greater than the thickness of the lens, and a scintillating fiber optic member centrally embedded within said circular lens, a means for mounting said circular sight support ring to a firearm, and a means of adjusting said circular support ring in relation to said means for mounting said ring to a firearm.