After the original three, Zartan would go on to recruit many more Dreadnoks, including the exposives expert Monkeywrench.
Another Dreadnok means another EM4 miniature, this one is 0064 Male Biker, SMG, Chain. There are a lot of little details that match up pretty well: the beard, the vest, the jeans and belt buckle. He even has a grenade on his belt and what looks like some electronic detonator behind him.
He's missing the shades and I totally spaced and forgot about his gloves, but otherwise, a great match.
Now, I think I need to move on to non-Dreadnok pastures for a while before I start motorcycle shopping...