There are two or three sides to this.

1. The gun lobby wants it. The concept is that a national law with national standards forces everyone to play by the same rules. I really can't imagine that happening, NY, Chicago/IL, CA, etc., just will simply not allow it if there is a way to prevent it. But the concept is there, just the same.

2. There is a real issue with respect to the rights of the Federal government to interfere with the ability/rights of the several states to make their own SCOTUS permitted "reasonable restrictions" on the right to keep and bear arms. A very thorny legal issue.

3. THERE IS A VERY REAL ISSUE with respect to Federal rules mandating this, that, and the other, databases, national registration, etc. Hard right wing thinkers are not overly pleased with this concept.

Notwithstanding all of the above, the Congress has the votes to pass it and I think Trump will sign it. Then NY/IL/CA and other states will sue and it will go to the Supreme Court. So let's not expect this any time soon. ICBW......