Yet, when the hundreds of hours of legislative debate, on camera pleas, backroom negotiations and intense lobbying have ended, groups like the National Rifle Association may find that they have narrowed the scope of gun control legislation.

CNN: Gun lobby may emerge victorious when smoke clears

On another issue, Republicans on the panel have expressed support for expanding the scope of mental health information submitted to the federal background check system used by gun sellers.

CNN: Senate panel agrees to new legislation on guns