I just bought a Colt LE6920C. Thats what it says on the box. The roll mark says "M4 Carbine" not "military/law enforcement only". So since it doesnt say mil/LE only why doesnt the label on the box say its an "SP6920"? I thought if it doesnt have the older discontinued roll mark that says "mil/LE only" then its automatically the newer "SP" model??? What do the SP6920's look like? I thought they are identical?