As has been mentioned, this bill has no co-sponsors, and a previous version died quickly. It's just like McCarthy's annual attempt at renewing the Assault Weapons Ban.
Look at Rep. Rush's history. Like most liberals, he fears nothing more than appearing irrelevant. HR 45 explicitly tries to stick a DC-style licensing scheme on weapons that were clearly protected in the Heller decision. It doesn't stand a chance.
Worry more about sneaky back-door regulatory stuff like OSHA's
1910.109 proposal (which also died quietly).