I have a Knight LK 93 with the 209 conversion. It has the hex head breech plug. Doesn't use any kind of a plastic jacket. Primer fits right into the breech plug.

I have noticed that the CCI primers i have now (brass in color) don't fit all the way into the breech plug. I have some older primers that i can't remember the brand that are silver and they fit all the way down into the breech plug.

Anyone know which brands of primers are silver in color?

Only reason i ask is when this gun used percussion caps, the cap wouldn't fit all the way down onto the nipple. Whenever i went to shoot it, the first trigger pull wouldn't fire the cap, only sinch it down on the nipple, where it should be. Pull the hammer back again and it would go off the second time. Kinda messes up your concentration when your shooting at a deer.

So i'm kinda paranoid about caps/primers that don't fit perfectly.