Overkill is back. And although they haven’t reinvented the (grinding) wheel, the old thrash geezers still have an impressive array of riffs to offer. Although the riffs are generally pretty crushing for a bunch of nearly sexagenarian metalheads, the veteran production job is what really makes this album’s millstones turn. It might sound like a poor compliment to say that an album’s most resounding success is in its production, but it really is that effective. One can hear it as soon as the riffs of “Mean Green Killing Machine” rip through the speakers. The guitar sounds appropriately meaty and aggressive, but it’s the thrum of D.D. Verni’s bass, sonorous and yet foreboding, that sticks out as unusually excellent.