Mike is correct about so-called Universal background checks. They are nothing except a back-door gun registration scheme by anti-gun Democrats. Unfortunately, there are a few RINO's such as my Republican Senator Pat Toomey who also support them.
I cannot recall even one recent mass shooting where the shooter did not buy his guns from an FFL, and go through and pass a background check. Such laws would not prevent these shootings. It is a Liberal Left Democrat smoke-screen which uses tragedies to advance more anti-gun laws.
I have taken the time to contact the White House, both U.S. Senators, and my Congressman to tell them that I will not support them if they support Universal Background checks, or other infringements upon the rights of law abiding U.S. citizen gun owners. I told them that current background checks should not include the make, model number, or serial number of the firearm being purchased. If all gun owners took the time to tell their legislators to stop messing around with our gun rights, these constant attacks would end very quickly. Remember what happened to anti-gun Democrats in the 2014 mid-term elections. Quite a few got their asses handed to them, and they joined the millions on Obama's unemployment lines.