dependent on the gun you could purchase an adjustable stock and fit yourself. Or if not available you can add adhesive foam cheek riser to the comb. They have a psa backing that sticks good if you clean the synthetic stock first. You can adjust the length of pull by adding plastic or aluminum spacers, you might want to add a recoil reducer to the stock. Your dimensions can be picked up off your trap gun as a starting point. You did not say what sport you were going to shoot with this gun, 3 gun or something other than trap, so you dimensions may need to be reduced a little. While you make you adjustments you can shot a point of impact target at 10 -12 yards, draw a cross hair on a 4foot square of cardboard and shoot directly (flat)at it. The shot will not spread and it will give you a starting location for the setup, gun shoots high, or low and make adjustments. You could call Ray Stafford in Broomfield , CO. He is a pro shooter and should be able to help. Rays number is 303-465-1006. Good Luck.