"It strikes me as odd that it's illegal to convert a semi-automatic weapon to an automatic weapon, but apparently these bump-stocks are not illegal under the current law", said Texas Republican senator John Cornyn.
The White House also said Thursday that it was opening to regulating the devices - but wants to hear more information on the matter before making a final determination.
Now, some are calling for a "bump stock" ban.More news: Google revamps Daydream VR headset, launches Pixel 2
NRA CEO Wayne LaPierre and Executive Director Chris Cox added in a joint statement that the NRA believed "that devices created to allow semi-automatic rifles to function like fully-automatic rifles should be subject to additional regulations".
The comments come days after the worst mass shooting in USA history erupted at Las Vegas at a country music festival on Sunday night when 64-year-old Stephen Paddock opened fire from the 32nd floor of his hotel room of the Mandalay Bay Hotel and Casino across the street from the concert.
Bump stocks, originally meant to enable people with disabilities to fire weapons, are generally seen as legal, and are available for as little as $99. Investigators said they were found on 12 of the Las Vegas gunman's rifles.More news: India pledges to provide over 195 Dollars loan for Ethiopia
Of particular note is the fact that when the previous legislation was passed prohibiting the purchase of automatic weapons, bump stocks did not yet exist. This increases the rate of fire to become almost indistinguishable from that of a fully automatic weapon.
Normally it can take the Bureau of Alcohol, Tobacco, Firearms and Explosives five to six days to trace a gun used in a crime back to the original buyer, a Justice Department official said.
The White House also announced it was "open" to congressional debate about the so-called bump stocks, spring-loaded devices which keep the weapon firing using its own recoil, shooting hundreds of rounds per minute.More news: 'Scandal': Olivia Has a New Love Interest -- But Where's Fitz?
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