What webleymkv said above is correct. Does that mean that Obama will not try it? He could try to put in an EO but it would undoubtedly be challenged in court. Unfortunately that could take years to wind through the courts and it would screw gun owners in the meantime. That would give Obama an immediate fix (albeit temporary) and allow the Dems time to work on a real law to screw gun owners.
"Quid Clarius Astris"