Why did Colt need two weapons designed field and sell only one to civilians?
I can't get the goat pepper spray...
What specifically was "modified" to make the Sporter a civilian weapon?
Who cares?
You should care. Because the parts that modified (your word, the proper term is redesigned) changed the weapon from a battlefield weapon to a run of the mill semi automatic.
BV is in question time out indefinitely, until he takes the pledge to answer questions one for one.