The Winter Soldier Minigun Minute Is Wrong, Actually
Sorry for being a pedant, but the Minigun in The Winter Soldier is actually based on the real M134 Minigun, it's just a handheld variant with shorter barrels. It's the same type that was used in Terminator 2, except The Winter Soldier's was an airsoft version, as it used visual effects vs Terminator 2's functional version that used blanks. All handheld Miniguns in movies/tv/games are based on the Terminator 2 Minigun. There are actually even smaller versions, one called the XM214 Microgun and then there's the ridiculous XM556 Microgun.