The Walther MPL (Maschinenpistole Lang) series is a family of 9x19mm Parabellum submachine guns produced in West Germany from 1963 to 1985 by Walther.
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https://www.youtube.com/watch?v=JzRZfj437kw
Free (CC0 - Public Domain) 3D model of the crate with hand-painted textures: https://opengameart.org/content/crate-5
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https://www.youtube.com/watch?v=ei7FiKaVspY