Are you retarded? Seriously?
1-2 phone calls and theoritically I could have any number of guns I want. It's already the law in California and it didn't stop the muzzies in San Bernardino. And you can't sell them at guns shows in CA without a background check and 10 day wait. So that already proves that the law doesn't work, let's add more laws? LOL
I go to gun shows all the time. There are dozens of dudes at every gun show, walking around with signs "Ar-15 for sale, $1500". If you approach them, they lead you to their car (Or they're already carrying it". They hand it to you, you had them 15 one-hundred dollar bills, and you walk your separate ways.
Sit around the snack area at any gun show, you see that shit nonstop. A person can make a good living that way... buy 100 rifles for 100,000. Sell them all over the next few weeks for 150,000... (just a markup from 1000 to 1500), and VOILA, the dude just legally made $50k per year. Just for selling on the weekends.
What kind of people are willing to pay 50% markup on a gun they can buy legally?

yes, maybe some getbiggers can "hop on the cell" and get their hands on ten AK-47s without using the loophole law, lol, maybe we all know major arms dealers. but I don't lol.