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From obsolete to trendy: The second coming of roller locked firearms :: Guns.com
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![Why so few rollerlocking guns? [Archive] - Calguns.net](http://upload.wikimedia.org/wikipedia/commons/thumb/5/51/DCB_Shooting_MG42_Roller_system.JPG/800px-DCB_Shooting_MG42_Roller_system.JPG "Why so few rollerlocking guns? [Archive] - Calguns.net")