Holster options for the HK P30 lineup aren't plentiful to say the least. Out of the few I've tried, this JM custom kydex aiwb holster has hands down been the best :
HK P30L Leather Thumb Break Holster | Pusat Holster
Does anyone besides HKParts sell a IWB Holster for the P30L with the Comp? : r/HecklerKoch
Profile IWB Holster in Left Hand for: H&K P30L | Tulster