ya, i just kinda threw the ar-15 in there because i think a true ''assault rifle'' is fully automatic.
submachine gun: auto that shoots pistol caliber rounds
assault rifle: selective fire rifle that shoots intermediate rounds from a magazine
battle rifle: rifle that shoots a full size rifle round
machine gun: auto that's belt fed
These are the common dictionary term definitions I could find that separate some types of guns. A battle rifle can be selective fire, the distinction between a battle rifle and an assault rifle is the full size rifle round vs the intermediate round. According to the dictionary, to be an assault rifle it has to have selective fire; pistol grips, flash suppressors, muzzle shrouds, the color black, and other scary looking features do not an assault rifle make. If someone in a debate on gun rights in the states actually knows the dictionary definition of an assault rifle (and has fired both assault rifles and battle rifles), chances are they're on the pro-gun side.
So yes, an AR-15 isn't an assault rifle, but it's not a battle rifle either.
Note: sorry to run off on a tangent like that, it just irks me how the ignorant side in the gun debate uses terms, hence I'm prone to run off on rants about dictionary definitions of things.
To get back on topic though, my National Match M1A is a good deal more accurate than I am. I'm doing good to hit half my shots at a man size target at 300m with iron sights, whereas that rifle is capable of hitting a man size target at over 800m.