Feinstein said legitimate accessories used by hunters would be exempt.
The firearms were recovered from three different locations - the gunman Stephen Paddock's room at the Mandalay Bay Hotel in Las Vegas and at his homes in Mesquite, Nev., and outside Reno.
"Did you know that you can do simulated full-auto firing and it is absolutely legal?" says one Texas manufacturer, Bump Fire Systems. Here's a look at the device. The gun is "bumping" against the stock, and thus is automatic.
Here's how it works: you remove the stock, the part of the rifle that goes against your shoulder, and replace it with a bump stock. The bump stock has a "support step" that covers the trigger opening.
"This measure would pose an unacceptable risk to public safety making it more hard for law enforcement especially in urban areas to identify gun shots, locate shooters and protect civilians". But he was a legal gun purchaser and legally amassed an arsenal of weapons that allowed him to consciously and without illness murder 59 and injure over 500 people.
A spring mechanism in a bump stock causes the rifle to bounce forward with every shot. But says the difference between a semi-automatic weapon and a gun with a bump stock attachment, all that changes is pull of the trigger and amount of bullets dispensed.
Is it legal to own?
Democrats have proposed various measures, including expanding background checks, prohibiting the sale of so-called bump stocks that can enable a rifle to fire 600 rounds per minute or more, and banning gun sales to terrorism suspects on the government's "no-fly" list. A fully automatic weapon would just let you hold down the trigger and fire until you're out of bullets. Yet the purchasing of fully automatic weapons has been significantly restricted in the U.S. since the 1930s.
Semi-automatic weapons are relatively easy to purchase.
But, according to leaked photos taken from inside the room and statements from the Bureau of Alcohol, Tobacco, Firearms and Explosives, that's not all they found.
Other than these small restrictions, gun laws in Nevada and New Mexico are practically identical.
In 1986, the federal National Firearms Act was amended further to prohibit the transfer or possession of machineguns by civilians, with an exception for those previously manufactured and registered. "The burden is on the government to show that you are too unsafe to have a firearm". If you do, expect to sit in prison for 10 years as you figure out how to pay the $100,000 fine. Gun control advocates also believe that military assault-style weapons - which are attainable for many USA citizens - should be either banned or face stricter regulations. It is illegal to make the gun into an automatic weapon.