I have the one with the mag safety and the internal lock. I had to take the internal lock to get the 15 round magazine. (I just ignore the lock.) I'm ok with the mag safety as it is just my home defense gun. I think the number is 209000 but the memory is not that sharp. Check the 2011 S&W catalog (free download) for a page with a table of all models and all features. There's one with 10 rnd mag and mag safety but no internal lock or thumb safety.
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