AP
FILE - In this Jan. 16, 2013, file photo, high capacity magazines are seen on display at the 35th annual SHOT Show, Wednesday, Jan. 16, 2013, in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, file)
- Julie Jacobson
FILE--Smith & Wesson hand guns hang on display at the Shooting, Hunting and Outdoor Trade show, Tuesday, Jan. 18, 2011 in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, file)
- Julie Jacobson
FILE - In this Jan. 14, 2014, file photo, John Montenegro of the Los Angeles Police Department S.W.A.T. team, examines a Sig Sauer MPX-K short barrel submachine gun during the Shooting Hunting and Outdoor Trade Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, file)
- Julie Jacobson
FILE - In this Jan. 17, 2013, file photo, Michael Kiefer, of DeFuniak Springs, Fla., checks out a display of rifles at the Rock River Arms booth during the 35th annual SHOT Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, File)
- Julie Jacobson
FILE - In this Jan. 14, 2014, file photo, knife manufacturers Les Halpern, left, and Marianne Halpern, of Three Rivers, Mass., examine a display of various handguns outfitted with laser sights on display at the Crimson Trace exhibit during the Shooting Hunting and Outdoor Trade Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, file)
- Julie Jacobson
FILE--In this Jan. 16, 2013, file photo, Nightforce rifle scope representatives discuss features of their products with potential clients at the 35th annual SHOT Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Julie Jacobson, file)
- Julie Jacobson
FILE--In this Oct. 4, 2017, photo, a device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26, just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Rick Bowmer, File)
- Rick Bowmer
FILE - In this Jan. 19, 2016 file photo, handguns are displayed at the Smith & Wesson booth at the Shooting, Hunting and Outdoor Trade Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/John Locher, File)
- John Locher
FILE--In this Jan. 19, 2016 file photo, Nolan Hammer looks at a gun at the Heckler & Koch booth at the Shooting, Hunting and Outdoor Trade Show in Las Vegas. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26 just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/John Locher, File)
- John Locher
FILE - In this Oct. 4, 2017, file photo, shooting instructor Frankie McRae demonstrates the grip on an AR-15 rifle fitted with a bump stock at his 37 PSR Gun Club in Bunnlevel, N.C. The largest gun industry trade show will be taking place in Las Vegas Jan. 23-26, just a few miles from where a gunman carried out the deadliest mass shooting in modern U.S. history. (AP Photo/Allen G. Breed, File)
- Allen G. Breed