Because I shoot low gun and stand straight with head not bent forward I find a gun with 3 to 3 1/4" of DAH fits correctly. I'm 6'4" tall and that may also have something to do with it. I believe gun fit is very important if you shoot gun down and want to be consistant. Having the same gun mount every time is just as important. I shoot seven different SxS's and have altered each one to have same dimensions. If the gun doesn't shoot to where you're looking how are you gonna hit anything ? Paul