No. No. No. You all are focused on the wrong things!!!
Here is what must be done: Outlaw sales of pressure cookers, require background checks for BB sales, and create a national database to purchase nails. This will keep us safe.
That would require ballistic finger printing of nail making machinery. But nails can be altered to appear to be from different machines. This will cost billions of tax dollars and be totally useless, so I therefore believe it to be a GREAT idea for DiFi to get right on top of.