Perfect is the enemy of good, and to be perfectly frank, all gun laws are ultimately flawed in some way. Better to start actually passing something though, and maybe we cut into the stats. But if we keep this hunt for loopholes going, we'll never pass anything.
That's...that's not a damn loophole. That's literally going "anyone the government doesn't like can be banned from getting a gun". Next GOP president, no one associated with #BLM will be allowed to buy a gun. Label them as "potential terrorists" internally (since the list is secret and arbitrarily decided), and boom, no guns.