Non veni pacem mittere, sed gladium.
If its a .50 or smaller its a rifle. If its bigger than .50 its still a rifle but illegal for us serf's to own. Until it becomes a "crew served weapon" THEN it is Artillery.
Nice Anti-Material Rifle! I think it's a Barrett .50?
.50 cal Barrett.
It's a Barrett MRAD. Biggest caliber is a .338 Lapua Magnum.
X2 - And don't underestimate the reach of the .338 Lapua
They make a 20mm sniper rifle now
and for whatever reason(enforcing camping regulations?) the US Dept. of the Interior bought two of them in 2014