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Carbines and rifles AR-15 are loved not only in the United States, but all over the world. However, the scheme of Eugene Stoner with the direct impingement of powdered gases does not seem to everyone to be reliable and perfect. For those who would like to equip their AR-15 reciprocating piston system, the American company Adams Arms releases special gas piston kits for upgrades. And also their own carbines of this popular format.