I used a GG&G product. This...USP Rail Adapter - HK USP Flashlight Mounts - Attach Streamlight and ITI Flashlights to the HK Pistol
Sorry, just noticed you didn't say USP. Not sure if that will work but hopefully someone here with better info. will chime in.
Sorry, just noticed you didn't say USP. Not sure if that will work but hopefully someone here with better info. will chime in.