Just got home and measured mine. 13 5/8. Based on standard process for LOP it's good for my arm length but other things affect it too, like neck length, shoulder mass, face length etc. If you find yourself having to reach out with the arm and putting tension on the butt then yeah I could see that being an issue. My MDT's I would adjust the spacers but the XLR seems fine. I've not actually had to thing about it is what I'm saying. Just line and it feels good. If anything I feel squaring up vs shoulder back brings my hand closer to the trigger.
Anyway, just curious, I ain't here to tell no one how to go pew with their bang stick. I ain't no pro