I’m running a similar set up (x carry grip 3.9 barrel and tlr7a) I picked up this S & G OWB, only used it once but really like it so far and being lefty, my choices are already limited most of the time lol. DSG. I don’t have an optic but it does have a cutout for them. As someone mentioned, trex are great options, look also at Tier one and QVO.