^^ Thank you for your response. I've looked at the Barsony mag pouches and they do have one that is a clip on model that is on my "maybe" list. I use a Kydex IWB holster that I like but the Kydex IWB mag holder digs in and bothers me.
My personal preference is to run the horizontal OWB type, with the base plate facing forward, because they poke me in the side less than the OWB vertical type, with the base plate facing upward, and definitely less than an IWB Kydex one would. I am left handed and normally run an IWB Kydex holster around 8:00 and my spare mag either around 4:00 in a horizontal leather pouch, or else in my right front pocket in a leather organizer, if I'm carrying my single-stack .380.
Having a clip-on type of pouch might be more convenient but I go with the loop types and just thread my belt through them. I thread my belt from left to right so the pouch goes on just before I thread it through the right-side belt loop of my pants.