ehhhh, I assume the guy meant an anti-material rifle? or some sort of autocannon if it actually is like a machinegun because anti-tank rifles are very antiquated and not a thing anymore, at least as a modern term for these weapons. That kind of thing got phased out since world war 2.
Maaaan, what an episode… I expected there to be drama but that hit me more than I thought. Like, my mouth was just agape the entire time at the end when Kano just blew up. I feel bad for her :(