A common thread element in most, if not all mass shootings, is ammunition.
In nearly every case, the shooter will amass a stockpile of bullets, enough for a protracted siege, but usually gathered by law enforcement after the killings. The federal government should enact a law stipulating the number of bullets which can be acquired, except by ordnance departments of law-enforcement agencies and licensed sporting ranges.
If, for example, 50 rounds a month was the limit, and any interest or request beyond that limit would necessitate an immediate contact with the FBI and/ or ATF. A cartridge is the fuel and motor of firearms. If monitored and well publicized, some weak-minded individuals may reconsider mass shooting situations.
Donald F. McHugh
Felton