But... background checks don't work. Never have and never will - and worse, these "feel good" laws divert resources from actual crime investigation and enforcement.
Millions of dollars wasted.
Why don't they work? Lawful gun owners know that criminals, terrorists and psychopaths either steal guns, use a straw buyer to buy them for them or carry out their crimes before they have been prohibited from acquiring firearms.
Any other interpretation of the impact on crime of these ill conceived false flag laws is pure delusional fantasy.
Terrorists have learned to recruit attackers with clean backgrounds - and in the case of the Florida nightclub a few years ago - even recruited a licensed security guard with a commercial concealed carry permit.
Background checks simply cause every lawful gun owner overhead, delay and bureaucratic expenses. Since they don't work, and have been proven to never work to stop or even reduce crime, calling for "Universal Background Checks" (really a national firearm registration scheme) to "reduce gun violence" is intellectually dishonest.
There are no "loopholes". "Arsenals of ammunition" just sit there. Background check laws do not prevent dangerous individuals from acquiring firearms, only from unlawfully buying them from a dealer if they are already prohibited. Only a national registration scheme could possibly detect (much less prevent) unlawful transfers.
How's about enforcing the law that says if you're a prohibited person and a law enforcement officer finds you in possession of a firearm unlawfully, you get prosecuted 100% of the time for 100% of the penalty? That would help reduce violent people from using guns because they would be in prison where they belong.