It is not exploiting a loop hole. Federal law allows for the building of guns in the privacy of ones home. Just because this individual has decided to use this

It is not exploiting a loop hole. Federal law allows for the building of guns in the privacy of ones home. Just because this individual has decided to use this to make a gun, does that mean that we should outlaw all 3d milling devices because some of them make guns? People have been building 80% lowers for years, without any background check, as the ATF does not consider it to be a weapon. All one needs is a drill press. Should we outlaw drill presses because they can be used to make a gun less then 1% of the time. Despite all of the other uses of a drill press? Also the difference between a gun and your meth example is that meth manufacturing is illegal in all capacities. The private manufacturing of a firearm is not considered illegal, as long as you do not sell that firearm that you have created.