Welcome to the asylum. As for the seven on the underside I have not an effin clue there. You will find that holster preference is like trying to get people to agree on pizza toppings, you will try many, and come to your own conclusions. There are all kinds of less expensive holster options available remember that Kahrs will fit in many a 1911 (think officer sized for your application) holster, and in a holster for a Sig (don't remember which model but it was one of the smaller ones that was better than good enough). Hang around and jump into the fracas around here, you'll be hooked plenty, and have a good time.