Ratchet lock assemblies for use with various locking actuation members such as, but not limited to, lock cylinders of interchangeable core cylinder types are provided. In one embodiment, a ratchet lock assembly includes a plunger barrel with at least one projection extending therefrom. The at least one projection configured to mate with at least one aperture of a locking bar or strike plate to lock the ratchet lock assembly in place. In another embodiment, a ratchet lock assembly is provided with an anti-shim configuration to prevent unwanted removal of the ratchet lock assembly. The anti-shim ratchet lock assembly includes a driver and cam to lock a member, e.g., a spring, of the ratchet lock assembly to a locking bar or strike plate.