Looking for a holster for my g19 gen 5. First of all is there a difference between the gen 4 and gen 5 when it comes to holsters? I ordered an Alien Gear shape shift because it didn't specify what gen it was for. I asked of it worked for the gen 5 and they said it didn't so I had to cancel my order. Now I'm back on the hunt for a good holster, preferably iwb, but I would prefer something that would go from iwb to owb so I don't have to buy 2.