Brian Witte/Associated Press"Assault weapon" is among the most contentious phrases in discussions on gun control.
There's not a universal definition of what an assault weapon is, which is part of the reason this subject tends to antagonize the gun lobby or gun advocates.
In short, gun enthusiasts typically say a firearm should be called an assault rifle only if it's capable of fully automatic fire — and they tend to reject the term assault weapon altogether.
"None of the so-called assault rifles legally owned by US civilians are assault rifles as the term is used in military contexts," Gary Kleck, a criminal-justice professor emeritus at Florida State University, told PolitiFact.
Kleck added: "Assault rifles used by members of the military can all fire full automatic, like machine guns, as well as one shot at a time, whereas none of the so-called assault rifles legally owned by US civilians can fire full automatic."