I'd have to agree with the 5CAV fellow.
Rifles are designated by their mission, not the marketing folks, or the guys that write games.
In my world the Barrett is an HTI rifle. Granted some tend to use sniper, HTI, and tactical rifle sort of interchangeably.
My favorite sniper rifle is the Stoner MK11Mod 0 with it's suppressor. ( a variation of the Sotner SR-25 LWM.