I'm pretty sure I tried every BH SERPA holster with my 24/7 Pro Comp. None of them were wide enough. The 24/7 seems to be wider than most pistols. Long Ago LEO tipped me off that a Bianchi CarryLok built for a Glock 19 works quite well (as in my avatar). I'd love to see if a PaddleLok would also work but I'm guessing it will be too tight as the CarryLok works due to the leather having room to stretch at the seams whereas the PaddleLok is one piece folded on itself... If I can find one in a shop I'll report.
This post is out of date. I have a BH SERPA holster that fits my 24/7 that is made of a H&K P30 that fits perfectly. I believe it was very new when I wrote the above.