Assault Weapon: political buzz-word mostly covering a semi-automatic only replica of assault rifle (if it looks like a machinegun (AR15) the public can be fooled into thinking its a machinegun (M16)). Then the buzz word "assault weapon" gets stretched to cover guns like the Marlin Model 60 18 shot tube magazine .22 rimfire rifle and a host of guns that are not weapons used in assault or even guns that look like "assault rifles".
A tube fed gun with a fixed magazine that holds over 10 rounds of ammunition is an "assault weapon" in California. A felony to possess unless registered during the brief window of opportunity, and illegal to pass on to any children or heirs in the state if it was registered.
Even such registered firearms are subject to extra restrictions, like transportation requirements above and beyond other rifles, including having to be in a locked case at all times.
"Assault weapons—just like armor-piercing bullets, machine guns, and plastic firearms—are a new topic. The weapons' menacing looks, coupled with the public's confusion over fully automatic machine guns versus semi-automatic assault weapons—anything that looks like a machine gun is assumed to be a machine gun—can only increase the chance of public support for restrictions on these weapons. In addition, few people can envision a practical use for these weapons."
From the Anti-gun Josh Sugarman himself in 1988. Understanding public confusion and menacing looks can help in creating a ban based on misunderstanding alone.
From around that point onwards the media would show clips of fully automatic firearms being fired, and then talk about "assault weapons" which had a similar appearance. Never mentioning there was any difference, and causing most of the public to conclude they were the same thing.
Much of the public believed "assault weapon" referred to fully automatic firearms, and that "assault weapon" legislation dealt with fully automatic firearms.
If they discussed a intratec-9 they would show a full auto version. Uzis would be show in full auto.
If they discussed an AK clone they would show a full auto demonstration.
If they discussed an AR rifle they would show the military training with m-16s.
Encouraging the perception that "assault weapon" referred to full auto firearms.
The media loved to show the most menacing looking firearms possible, passing up on any that had a more traditional appearance.
When restrictions were finally passed they extended well beyond just the type of firearms originally associated with the media and "assault weapons".
The legal category has also continued to grow in places that still use the term.
Including designs and features at the whim of legislators, to increase the banned or restricted category.