5.56×45 October 30, 2026August 5, 2013 by ammobuyersguide 5.56×45 5.56 x 45 mm Blank M2005.56 x 45 mm Blank M200 0.224 inches (5.7 mm) 3.95 5.18 g 930 772 m/s 1,700 1,830 J ArmaLite5.56 x 45 mm Dummy M1995.56 x 45 mm Dummy M199 0.224 inches (5.7 mm) ArmaLite contacted Remington 19635.56 x 45 mm M8555.56 x 45 mm M855 0.224 inches (5.7 mm) 62 grain 2,700 ft/s (820 m/s) ArmaLite contacted Remington 19635.56 x 45 mm M856 Tracer5.56 x 45 mm M856 Tracer 0.224 inches (5.7 mm) 63.7 gr 2,700 ft/s (820 m/s) ArmaLite contacted Remington 19635.56 x 45 mm M995 AP5.56 x 45 mm M995 AP 0.224 inches (5.7 mm) 19925.56 x 45 mm NATO5.56 x 45 mm NATO 0.224 inches (5.7 mm) 3.95 5.18 g 930 772 m/s 1,700 1,830 J ArmaLite contacted5.56 x 45 mm SS1095.56 x 45 mm SS109 0.224 inches (5.7 mm) 62 grain 2,700 ft/s (820 m/s) ArmaLite contacted Remington 1963