I'm a lefty as well, and I use the Wilderness Safepacker (link below). When I'm out in the woods, or doing yard work, I can access my firearm about as quickly as any holster out there, but not an ounce of brush, dust, debris, light rain gets on my gun! I can (and have) rolled in the dirt with them and my firearm stays clean, nothing can touch the trigger and it will never fall out. What I really love about them though, is that it's not only a holster, it's an awesome carrying case too. I have four of them for different pieces, and those firearms simply live in them. From the safe to the field, from the field to the truck, from the truck to the closet - etc., etc., they never have to come out of the Safepacker. They are not the cheapest option, but you buy them once and you're done. Oh, and they're designed so you don't have to take off your belt to put them on/take them off.
https://www.thewilderness.com/safepacker-concealment-holster/
