i use a comp tack Minotaur MTAC Holster. i like the adjustable clips. makes it easier to find the right position. i tried small of the back but it was not comfortable in daily use. i have carry mine on the right front. easier to sit down with and getting in and out of my truck.
http://www.comp-tac.com/product_info.php?products_id=95
http://www.comp-tac.com/product_info.php?products_id=95