its an option, you can get it if you want but it not a standard featureHmmm, so is it just the TACTICAL's that have the thumb safety? My SC9 doesn't have a thumb safety. That's one of the things I LIKE about my SC9.
I have been thinking of getting a full size XD for IPSC and I don't want the thumb safety. I'll have to look closer at some full size pics to see for myself.