Hi Boots&guns, First congrats on taking the first steps to being prepared.
A few things I would tell you is only use the uncle mikes "holster" for maybe keeping in the safe or on the night stand. I would not recommend carrying with one, You really want a holster that would facilitate reholstering one handed if needed, AND one that securely holds your firearm in place. As you have already mentioned and found out for yourself this one does not. That is a problem with generic one size fits many holsters. There are lots of options out there and people have different opinions on them as well. A lot has to do with what you like, and feel comfortable with. I used to carry in a leather holster, but found that after a period of time the leather would break down..... This is not so bad if you keep it in the holster, and never practice your draw, and reholster, or do any training with it. Some will hold up better than others. At first I carried OWB then I started to carry IWB with a Galco Summer comfort, and then the King tuk. I have now switched to a Kydex that is custom made for my firearm. There are many options for these as well. I happened to find a manufacture of a brand that I consider one of the best holsters I have ever owned. (And cheaper too! I bought a $70 one recently that the internet was raving about, after two days, Im back to my $35 one! haha The company is called On your 6 Designs) I have also seen where leather can sometimes become worn or "molded" based on where and how we wear it to our surroundings, for example I had a student who drove all day and the connector from his seat belt made an indentation in his leather holster, after several months.
As for the flash bang a close friend just bought one, She did not like it at first, she said it was comfortable and not noticeable but awkward at first drawing with it, but after two days she called me and said she loved it, and has been recommending it to all her friends. She told me that after just a few days of practicing with it, it has become a second nature process to draw, shes gone on several dates and to work with it and has never had any issues with it, she has even forgotten that she had her gun with her.
Good luck in the class. I am going over to reply to that post now! LOL