Walmart arrows are probably fine. What equipment do you have? If you are using a bow that does not fit you correctly, you will never be able to shoot your best. You should be fitted for a bow. Once fitted and the bow is set up, they can measure you for the proper arrow length and proper arrow spline. If your bow fits you already just have the pro shop cut your arrows to the proper size (as long as they are of proper spline).

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KEC