This episode originally aired in 2002, I'm watching it in 2019, and that indicates how long the public has been provided with bad information & false claims regarding firearms. In this episode, investigators supposedly search for all the people in Virginia who have purchased AK-47 assault rifles, but unless you have a federal firearms license (FFL) it's illegal to have an AK47 in the Untied States. They are "selective fire" firearms which means they can fire semi-auto AND full auto, and full-auto firearms have been illegal in the U.S. since the 1930's. A FFL holder can own one, but can't sell it to a member of the general public.
The episode also refers to a semi-auto AK47, but there is no semi-auto only version, and it is stated that along with the Russian military, the Chinese military uses AK47s -- no they don't -- they make their own version, called Type 56. The is also a Chinese-made semi-auto only rifle that looks like an AK47, the MAK90 & it is legal to own one of those in the US because it cannot be converted to full-auto.
Also, the term "assault rifle" is often used in the episode, but by definition, an assault rifle is selective-fire -- there is no such thing as a semi-auto only assault rifle. Note the news media now refers to "assault-type" rifles -- apparently someone in the "news" media knows the difference between an actual military selective-fire assault rifle & a semi-auto version that looks similar.
If you didn't know better, watching this episode would make you think that AK47s are a dime a dozen & anyone can go to a gun store or gun show & buy one -- no you can't. If you don't have a FFL it's a federal felony to have one in your possession & FFLs are not easy to get -- among other things you have to go thru a very thorough FBI background check that can take months
I really have a problem with shows like this one (there are MANY) because of all the false information that's presented. It's either intentional, or the producers know nothing about firearms & if that's the case, they shouldn't be making shows about them.