Retired ATF agent Sam Rabadi told CNN New Day's Alysin Camerota bump stocks should be illegal. (Just remember, as we showed you the other day, a rubber band does the same thing.)

"Let's talk about the bump stocks, when you and I first spoke on Tuesday in the hours where people were still piecing together what had happened, that's when you first started basically explaining to so many of us who didn't know, that these bump stocks that can turn a semiautomatic rifle into an automatic weapon, that they are legal to buy and readily available and inexpensive," she said.

"As a law enforcement officer for so many years, as you were, do you think those devices should be illegal?"

"So even though this particular accessory is legal, I find, my own personal opinion, there are very, very few, if any, uses, legitimate use for this type of accessory. it would never really be used during hunting. It's just the gun could be pretty inaccurate, difficult to maintain control of, because of the use of the accessory. It would not really be used for target practice," he said.

"The only legitimate use, as has been discussed, is more of the thrill of being able to shoot a machine gun type of rifle. That's pretty much the only legitimate use I could see. As a law enforcement officer, as I mentioned, last couple of days, the last thing I would ever want to see is this kind of device attached to a long gun that a law enforcement officer has to go up against. it's pretty scary."

Camerota said the bump stock is what allowed this gunman to "mow down 58 people and injure close to 500 in the space of 10 minutes. The idea that he could do it inexpensively and easily online, and I have other bad news for people. The sales of the bump stock have spiked, obviously, since Tuesday, not surprising, talking about heightened interest in it, and so now, one of the manufacturers of it is sold out."

Swell.