Well, we will see if Mr. Paddock had a Class 3 license. If he did, then he was perfectly legal to own and carry the weapon.
Or it could have modified
The debate is legality...it is HIGHLY illegal to alter firearms in a way that makes them fully auto unless you have acquired the correct license.
Wrong
How to Make Your Gun Shoot Like It’s Fully Automatic—in One Easy Step – Mother Jones
That’s because, despite enabling rapid fire that mimics a fully automatic weapon, Slide Fire doesn’t appear to violate the production ban in the National Firearms Act. The law only
regulates weapons that are designed to shoot “automatically more than one shot, without manual reloading.” The way the Slide Fire works, as Cottle explained to
Guns America, makes it easier for semi-automatic gun owners to do what they’ve been doing anyway: “bump firing,” which is where you simulate automatic firing by rocking the gun against the trigger finger. (This practice can also lead to highly
inaccurate shooting.)
The Slide Fire helps shooters increase their accuracy and number of rounds—without actually firing automatically. “You actively fire every round, and if you stop pushing forward or you take your finger off the trigger the gun stops firing. It just helps you fire the gun in semiautomatic very fast,” Cottle told the magazine.
A
letter from the ATF on Slide Fire’s website certifies the part’s legality for exactly that reason. According to the letter, Slide Fire told ATF that the stock “is intended to assist persons whose hands have limited mobility.” So, basically, if you are missing a hand and need to fire a gun like Capone, the Slide Fire is for you.
Coulson, the ATF spokesman, confirmed the stock does not violate any national laws, and Stephen Halbrook, an attorney who has represented gun companies and the NRA, says “if it was even borderline illegal, ATF would have told them, no, you can’t market it. I’ve met the guys there and they’re very strict.” In 2006, the ATF
revoked its approval of a strikingly similar piece, the Akins Accelerator. But the Akins Accelerator, unlike the Slide Fire, included a recoil spring in its design. (It has since been successfully
relaunched without the spring.)