Models like the Mockingbird, Warlock, and Bich can use a whammy bar, as they are equipped with a Floyd Rose tremolo system or a similar type of tremolo bridge. These bridges allow for the string tension to be changed by moving the bar up and down, creating a variety of pitch effects.
However, some other BC Rich models, such as the Beast, the Stealth, and the Gunslinger, do not come with a whammy bar. These guitars typically have a fixed bridge, which does not allow for the strings to be vibrated in the same way as with a whammy bar.
Therefore, whether a particular BC Rich guitar can use a whammy bar depends on the specific model and its bridge type.