I have a HK45C that I routinely carry. The best holster that I have found for it is made by Kramer out of Tacoma, WA. It's an IWB with snap leather loops and a nice forward cant. I carry the HK comfortably all day with this holster. They craft an identical holster for the HK45. Check them out. They are reasonable and very well made.
http://www.kramerleather.com/product...TOKEN=99400867