While the 9mm are capable for SD the 40 S&W are more powerful. Whether you can handle it is up to you. I have a Sigma 9 I'm happy with. I have the Sigma 40 on order so soon I'll find out how it goes. It is back ordered for now.
EDIT: by the way the Sigma 9 holds 16 rnds while the Sigma 40 holds 14 rnds so that's pretty close. Both guns are the same size.
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