I'm sure this has been asked before, but here goes. On K-var's web site there is fine print relating to their parts kits

"According to Federeal importation restrictions the barrels from AK-74 Parts Set can only be used for repair & replacement. The barrels can not be used to build 922(r) compliant guns."

I have noticed disclaimers like this on other web sites as well. What does this mean? If I can't use the barrel to build with, then what good is the kit? I have no desire to break any firearm laws, but I know sometimes resellers go a little disclaimer-happy.

Possibly something having to do with a short barrel or it being threaded?

This is not a legal finding or anything like that but the current opinion of many of us gunnuts is that the prohibition of using current part kits to build new firearms is meant for the tax paid manufacturer and not the home builder.