#silencer
The firearms industry wants to go much further:
It is supporting lawsuits to overturn remaining state bans on silencers
and pushing federal legislation to remove them from the National Firearms Act,
the 1934 law that made them harder to purchase.
Those goals have been energized by Republican victories in the November election and a Supreme Court that is more gun friendly than in the past.
Silencers can reduce the sound of a gunshot below 140 decibels,
the limit for what is considered safe, though similar protection can be achieved by using ear plugs and earmuffs, which are standard at shooting ranges.
The growing popularity of the devices has increased concern that they could render a mass shooting harder to detect.
Silencers also reduce muzzle flash and recoil, making it easier for a gunman with a semiautomatic weapon to keep aiming and shooting.
Silencers are not often linked to crimes, although instances of their use have been gradually increasing,
according to federal trace data.
Gun rights groups claim that the criminal use of silencers is not a problem,
while gun safety advocates say stricter regulation of the devices has worked.