dean- I bought a staghorn cva 50 cal yrs ago at the wally world here in pt. angeles, we took the 209 out of the breech plug and put in a musket cap nipple right there off the shelf. is legal and works good, only thing I have found is it doesn't like the pellets- pyrodex or triple 7, but the fffg triple seven powder shoots excellent out of it. I recently put a williams peep sight on, what a difference! Recently bought some harvester sabertooth belted muzzleloader bullets- 250 gr. them with 85 gr. of triple seven makes excellent groups with mine, hope thuis helps ya, big iron.........