I also have a full size M&P 45. I had my holster made by Mike at Longhorn Holsters. He is a site partner and as nice of a guy as you'll find. My favorite holster I've found. I use it to carry whenever I'm not on duty. I'd be happy to meet up with you and let you check it out before you order one. Mike also made me a mag pouch that is top notch. He will be making me another holster shortly for my M&P 40c that is my backup.