The AR in AR-15 may stand for Armalite, but an AR-15 is still an assault rifle.
The U.S. Army defines assault rifles as "short, compact, selective-fire weapons that fire a cartridge intermediate in power between submachine gun and rifle cartridges.
And
…examples of intermediate cartridges are the 7.92×33mm Kurz, the 7.62×39mm and 5.56×45mm NATO.
The AR in AR-15 may stand for Armalite, but an AR-15 is still an assault rifle.
And
AR-15 is not selective fire. That means fully automatic, something that is already effectively banned in the USA.