If I was a terrorist and I wanted to get my hands on a weapon and somehow the govt managed to stymie my attempts to buy one legally there are numerous ways I could get one anyway.
I could burglarize a gun store. Lots of that going on lately
I could burglarize the home of a gun owner.
I could follow a legitimate purchaser home and rob them.
Perhaps I could get Obama to give me one like he gave to the Cartels in his famous Fast and Furious debacle.
I could get my cohorts in other countries to send me one in a shipment of drugs that are coming across the border anyway.
Most, if not all of the current proposals to control guns will have no effect on terrorists, but they will cause immense problems in the lives of american citizens who only want to defend their homes and their families.
Ya want to reduced gun ownership in the United States??? Increase the trust of the citizens in the government of the united states. The current flurry of gun buying is not caused by anything other than a base distrust of the government. Obama and his ilk, along with the establishment republicans who have failed to do one single thing they promised to do if we would only elect em one more time.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!