they are their to classify it. the letter describes the weapon. Example M=military AR=assault Rifle LMG=light machine gun ect. the number represents the model number. so in M-16 it is military rifle and was 16th design. Not all designs are excepted and that why there are gaps in the numbers.
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Six states have five or less letters in their name. Iowa, Ohio and Utah have four letters in their name. Idaho, Maine and Texas have five letters in their name.
North Carolina and South Carolina have 13 letters in their name. Massachusetts has 13 letters in the name.
September is the month having the most letters in its name.
Elizabeth is a girl's name that contains nine letters.
Hippopotamus,Yellow jacketThe hippopotamus has twelve letters in its name.