That is a #11 hammer. Like SL said, you need the one with the cone on it for 209's...and obviously the different breech plug. I tried 209's in one of mine...honestly, I didn't see any gain ... it just cost more. I went back to #11's now in all my mk's. That system is flawless, for me anyhow.

The cone hammer can ignite both 209's and #11's, but you will likely flare out the nipple prematurely if you use it with #11's.