They mention a threaded barrel that can accept a silencer. They fail to mention that using a silencer in the commission of a crime is illegal. They also fail to mention that very few states even allow the possession of a silencer and the federal controls are exceedingly tight. You also have to pay a LOT of money for the special tax stamp that has to be affixed to the silencer. I should also mention that when the silencer heats up, the tax stamp starts to degrade. If so much as a flake of stamp falls off the silencer – you guessed it before I could finish this sentence – yep, you have to buy another one!
As a side note, there are places in the European Union (that is not at all friendly to firearms as the United States is) that require a silencer when hunting near dairy farms. It seems the cows get upset and stop producing milk.
They do not care about gun violence (just about banning all guns) and they do not care about safety. They have pushed for barrel shrouds to be banned! A barrel shroud prevents the shooters hand from being burned. Needless to say, if your hand is burned while shooting, you will not be accurate and may cause violence to happen to an unintended target.