from RMC Manufacturing Co. All metal construction brings the strength and durability often missing in early generation fiber optic sights.  The fully adjustable rear sight mounts easily with wrench (included).  Features high-contrast, green fiber optic element in rear and red in front. Many styles available to fit popular muzzle loading, black powder rifles. for CVA octagon barrels No. 5044910, for Thompson Center 1" octagon barrels No. 5044916. for Thompson Center 15/16" octagon barrels No. 504493 for Traditions Deerhunter No. 504497. for Lyman Great Plains rifle No. 504499