Buy a used RG7421 or RG7621 instead. The necks are a nicer profile and also (no one ever seems to mention this) the body contours are deeper, making tha guitar much more comfortable to play. Both have Gotoh tuners and the RG7621 also had Dimarzio "New 7" pickups as stock. Pay around $350ish used.
Alternatively, the Blackjack is a better specced guitar in the first place. It has a fatter neck though, and the carved top has a lip to it that digs into the bottom of your forearm. It's a nice guitar though, and the Duncans work well in it.