Sauron didnt have gunpowder. Saruman did. However, just because he knew how to make gunpowder, doesnt mean he knew how to create a gun. they are complex things that Saruman would need much time to make and mass produce for his armies. Look at our own history, the Chinese invented gunpowder and had it for hundreds of years before the first crude gun was made.
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He came unto the timeless halls where shining fall the countless years and endless reigns the Elder King in Ilmarin on Mountain sheer
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