Yes and as Randy says, they can be little bastages, here are some live-fire tests I ran by putting 5 ampulomets in the trees and seeing how they did against different AFV's. Predictably they made mincemeat of light armour and can even hurt medium tanks in the side armour.
Heck they even knocked out a Tiger frontally, but its a very, very rare occurrence.
But its certainly worthwhile having a go at heavy and medium tanks because you might blow a track off or damage the gun even if you don't kill it..