bolt-on
Custom Pickups, Five-Piece Roasted Maple Neck, Korina Body, Thin Finish, Hipshot Ultralight Tuners, High Mass Bridge, Initialed Headstock, Pickup Pan Control, Custom Dome Knobs, Boneite Nut, 3 String Tree, Dual-Action Truss Rod, Six-Bolt Neck Plate, Custom Jack Plate, Pure Tone Jack, 10% Pots, 10% Poly Caps
| Construction | bolt-on |
| Body | Korina |
| Neck | Maple/Walnut |
| Fingerboard | Roasted Maple or Rosewood |
| Neck Pickup | Split Brick |
| Bridge Pickup | Thick Brick |
| Controls | Volume, Tone, Pickup Pan |
| Bridge | String-thru-body or Top-load, 3/4 spacing |
Artists documented playing the Reverend Mercalli 4: Karl Alvarez, Me’Shell Ndegéocello, Nicole Row, Ryan Scott Graham.