ok, 5.56 calibre would not be fired from a rifle. 5.56mm is a common round size and more similar to the .223. i have no idea what these "simunitions" are but i feel reasonably certain they are not 5.56 claibre.
just so you know, calibre for small arms is the size of the round in hundreths of inches. so a 5.56 calibre would be a tad over 5 and a half inches around, about half of a fist.
just so you know, calibre for small arms is the size of the round in hundreths of inches. so a 5.56 calibre would be a tad over 5 and a half inches around, about half of a fist.
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