There is no Bareknuckle that sounds like a Duncan JB. The Riff Raff, Black Dog, Abraxas, and Holy Diver will get you in that range. Probably especially the Holy Diver or Black Dog. The JB is an off/on love kind of pickup. Sometimes I love it and sometimes I don't. Dimarzio makes something called a Norton which is a lot like the JB, but a little bit better. However, if I had to choose between a Duncan, Dimarzio, or Bareknuckle, I would go with Bareknuckle just because I've always gotten exactly what I want from Bareknuckle pickups. I've never felt like there was something missing, too compressed, not enough output, etc. Duncan and Dimarzio are the original greats, but Bareknuckle has stepped up the game a notch.