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other uses, see AR 7 (disambiguation). The ArmaLite AR-7 Explorer is a semi-automatic firearm in .22 Long Rifle caliber developed from the AR-5 that was adopted

company's firearms: AR-5, a .22 caliber rifle; the AR-7, another .22 caliber; the AR-17 shotgun; the AR-10 rifle; and the AR-24 pistol. In 1959, ArmaLite