Holsters for the Sig 226/229 with rail will work fine. At least the Gould and Goodrich one that I have does.
High Noon holsters makes good quality leather holsters for the 3913/4TSW with rail.
I have the Tailgunner version. Turn around time was 2-3weeks. They have been offering 30-50% off pricing recently. Definitely worth a look.
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