Here's a gun question:

[spin]

13. Perhaps this might help. ...

Assault rifles vs. assault weapons

The term assault rifle, when used in its proper context, militarily or by its specific functionality, has a generally accepted definition with the firearm manufacturing community.[1] In more casual usage, the term assault weapon is sometimes conflated or confused with the term assault rifle.[106]

In the United States "assault weapons" are usually defined in legislation as semi-automatic firearms that have certain features generally associated with military firearms, including assault rifles. The 1994 Federal Assault Weapons Ban, which expired on September 13, 2004, codified a definition of an assault weapon. It defined the rifle type of assault weapon as a semiautomatic firearm with the ability to accept a detachable magazine and two or more of the following:

a folding or telescoping stock
a pistol grip that protrudes conspicuously beneath the action of the weapon
a bayonet mount
a flash suppressor or threaded barrel designed to accommodate a flash suppressor
a grenade launcher

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Assault weapons legislation does not further restrict weapons capable of fully automatic fire, such as assault rifles and machine guns, which have been continuously and heavily regulated since the National Firearms Act of 1934 was passed. Subsequent laws such as the Gun Control Act of 1968 and the Firearm Owners Protection Act of 1986 also affected the importation and civilian ownership of fully automatic firearms, the latter fully prohibiting sales of newly manufactured machine guns to non-law enforcement or SOT (special occupational taxpayer) dealers.
https://en.m.wikipedia.org/wiki/Assault_rifle