Congressional Republicans clearly agree with the NRA that "the right to bear arms" is an absolute one and not a qualified one. Opinion polls, however, are that a majority of the population disagree.
The other problem is that anything the Democrats put up is automatically opposed by the Republicans -- and vice versa.
The situation therefore remains that psychos and Muslims can legally buy the most destructive portable weaponry they like to murder as many people as they can. And that is intolerable.
There are questions about why the FBI failed to do something to intercept the San Bernardino and Orlando murderers when there were glaring warning signs about their jihadist inclinations and state of mind, but that is a separate issue.