I saw a similar Kydex boot holster for a small auto. Thought I would try it out for a Bond Arms derringer. Second try, both have problems. Should be sturdy as it is glued, sewed and riveted. Finished with EVOO that I am not that impressed with. Also my first shell loops. Too far apart I am sure although I measured cartridge plus 2x leather thickness. Main problem is gun won’t extract when on boot. Extracts fine off boot. Carries well, comfortable. Wondering if it needs some kind of stiffener behind pouch.