Since you have a left port I would get a left hand action base, I run single piece EGW on all my guns. Like the 41020 series bases. The base just has a little bevel on the edge, and that bevel is on the side of what hand the base is made for. I have had a right handed base on one of my left hand guns since it was what I was able to get at the time and I had no issues with it.