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In page Submachine gun:

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In 1969, Steyr introduced the MPi 69, which is similar in appearance to the Uzi SMG.[3] The MPi 69's receiver is a squared stamped steel tube that partly nestles inside a large plastic molding (resembling a lower receiver) which contains the forward hand-grip, vertical pistol-grip and the fire control group,[3] making the MPi 69 one of the first firearms to use plastic construction in this way.[citation needed]