With the size of the Smith and Wesson M&P45 full frame I found the 3-3:30 position worked for me. I tried it a little further forward and it gets into my ribs and puts pressure on the crease at my lower groin when I sit with it so 3 to 3:30 was best. As soon as it was out of the package it was on me. Love it... Worth the money and it's not a gimmick...