Depends on your rifle, most, not all rifles, come with all three options for ignition. In my state, 209 ignition is not legal, must use musket or #11. My black diamonds came with all 3 options and it is just a matter of changing the nipple type, but other guns require a change of the entire breech plug. On the same note, I found that musket caps are available without the flange from RWS and use that type because I can slip a piece of surgical tubing over ther cap and nipple to keep water out, works well. Good luck, Tim