Cabledad: Do you have an "A2" style stock, or what, exactly? If it is, you can easily, and at a wide range of prices, replace the classic A2 stock with any number of adjustable stocks that accommodate different lengths of pull, and that also have adjustable cheek risers that modify the height of the top of the stock for sighting alignment. They're not exactly cheap, but most are not exorbitant either.
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Heavily armed; easily pissed.