I have yet to find one other than a nylon universal drop leg holster by blackwater(discontd) and Tactical assault gear. Condor has a new one that is pretty cool and cheap. I think blade tech makes one that encloses the muzzle.
Please let me know how it works out and let me know how you like the retention system function and practicality....I have a Safariland on order. I can return the Blackhawk serpa for credit and I have a coopin (Ron White) for some more off from other purchases there. This one specified the 5" barrel both on Safarilands website and Optics planet site. Hopefully it will work. I think Safariland maybe one of the only ones that makes the whole drop leg for it so far.
I kept the Blackhawk dropleg platform because a couple of other holsters I have for other pistols fit it so all was not lost it seems. Plus I like the idea of tricking it out with other stuff for the left leg if need be. IT IS TACTICOOL