The freak bored barrel is a stock barrel that is bored out and does NOT come with an insert. You'll have to buy one whether it's a Smart Parts freak, or a TyMc brass intsert (the latter recommended
You shouldnt need anything over .680 unless you're in an area of really large paint. The insert barrel is mainly for folks who have super small paint that even .680 wont hold.
Did that answer all of your questions? I may have missed one or two.