If it will change it depends on your rifle, and the stock you select. A synthetic stock is more durable, but will never look as nice. If your rifle has had any work done to it, you may have to duplicate it on the new stock to achieve the safe performance. As an example, if your stock has had any bedding, or floating done, it most certainly would change your accuracy, either for the better or worse, with your new stock. Is your old stock damaged? Or do you just want to change it, just because?