In many ways it makes sense, what it failed to accomdate for was antique and collector type weapons and things on the fringe. The State Dept Military Assitance Plan injunctions also have unintended effects on re-importation, for instance it is illegal to re-import lend lease items. For small stuff it is ignored, but it means you can't buy a jeep from France that was left behind. This is an attempt (albeit weak and obtuse given the plethora of domestically available weapons of all varieties here) to prevent cheap high powered things like AK's PKMs etc slopping around the underworld. However if you are a dealer it is a license to print money as artificial shortages are created. State department and ATF types I deal with at times for work readily acknowledge the legislation was to generalized and has unintended consequences, but the political process to refine things is difficult and unlikely to be taken up. More regulation in the age of 'terra' is always politically popular. It is like the health & safety culture in the UK.