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Category:5.56 x 45 mm NATO - Wikimedia Commons
5.56×45mm NATO - Wikipedia
List of 5.56×45mm NATO firearms - Wikipedia
5.56×45mm NATO, Military Wiki
File:5.56 x 45mm NATO bullet casings-ar 5to4-fs PNr°0273.jpg
Category:Cartridge cases - Wikimedia Commons
File:5.56 x 45 mm NATO.jpg - Wikipedia
5.56×45mm NATO, Military Wiki
5.56×45mm NATO, Gun Wiki
List of 5.56×45mm NATO firearms - Wikipedia