I have a Glock 20 gen 3 in which I would like to install a Lone Wolf extended barrel with 2 ports in the portion of the barrel that extends beyond the slide. The overall length of this barrel is about 5.5". I would also like to purchase a practical nylon or other synthetic field holster for use while hiking and backpacking. The holster would have to be left handed and would be worn OC on a 2" belt or attached to the side of the pack. What do Glock shooters who have installed 6" barrels use for a holster?