The Knight Bare 209 Primer Capper Decapper is designed specifically for use with Knight muzzleloaders that use our 209 Bare Primer ignition system. Intended application is for Knight Rifles equipped with our Bare Primer Bolt and Breech System and allows for quicker and easier primer installation. Place a Bare Primer (face down) in each of the holes available for ease of use in loading and unloading of your Bare Primer Ignition System.