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The AR-15 is the best-selling rifle in the United States, industry figures indicate. Almost every major gunmaker now produces its own version of the weapon, which dominates gun dealers’ walls and websites. Critics claim that the military-style gun has no legitimate civilian use — yet about 1 in 20 Americans own one. So who chooses to buy an AR-15, and why? The Washington Post and Ipsos asked nearly 400 AR-15 owners to explain their reasons for having the weapon, what they use it for and how ofte