I've had pretty good luck with my G19/23 holsters fitting the P10C. My Kramer OWB Scabbard was a bit tight at first but works really well now and three of my 4 Serpa holsters seem to fit. I have Serpas for a G23, G27, G21 and G30. The 21 and 30 holsters are loose but lock in and retain the gun nicely. The G23 holster is tight, but locks in. I think that I could take a bit of material out of it to fit better. The G27 does not fit at all. I have a G22/23 shoulder rig that works perfectly and a Mills Tactical IWB holster that's tight, but works.