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David C. asked 7 years ago:
David, most AR15's already have a top Picatinny Rail built into the receiver. You would need this rail only if you needed to raise an optic higher. AR receiver here : https://www.google.com/search?q=ar15+receiver&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjvvPTH6MLfAhWohOAKHXnpD8QQ_AUIDygC&biw=1280&bih=618#imgrc=OWTNGNk0VSh5YM:
James G.
7 years ago
