Another piece of advice
You may be tempted to install adjustable combs and buttplates on you gun. Don't do it! You will spend so much time trying to get just the right dimensions you will eventually end up in the Mental ward. Get a good fitting and stick with the measurements, don't continually try to adjust the gun.
If you miss check your technique and go back to basics. Take a lesson with a good coach. I have seen more shooters try to blame the gun when it is something they are doing wrong. When I miss a lot I have come to realize it is me, not my equipment.
Geoff Ross