These are the holsters I have for my USP9c, USP9 and USP9 Expert:
For 3 Gun and range - I removed the additional retention because its just not required. Pistol snaps into the holster solid. Even the compact works really well in this holster. Love the RTI system.
Check out the deal on XST RTI Kydex Holster at Edge Works
www.tacticalholsters.com
Leather - Pure Kustom Black Ops Pro OWB / IWB - Rocky at Pure Kustom makes some outstanding holsters and they fit perfect day one and have done so for several years. They are treated in a way that makes the leather quite hard, much like a Kramer horsehide holster. Cost a bit but worth every penny.
Appendix Carry - Tier 1 Axis Slim - Bought this for a USP9C - but it now works for my USP9 fullsize too. If you want it to work with both ask them to make it open ended. Mine came as a closed ended holster even though all pictures at the time showed open ended and the two previous Axis Slim holsters for other pistols both came open ended. My Dremel corrected that issue. Its a great AIWB holster. Handles the full size pistol and remains remarkably concealed even with the Jet Funnel magwell and magazines. I don't use the Expert in this holster.
You are looking at our AXIS SLIM holster! Specially designed for appendix carry, this new design stays true to the flexibility of the original AGIS, with a different twist. The AXIS SLIM is fastened together with military-grade shock cord and allows the firearm to flex closer into the body...
www.tier1concealed.com