Cam KII Abs are pretty good. Many of them should work fine. Check the Abs for species reactivity and for usefulness in immunohistochemical staining. Use a pan CamKII Ab and a polyclonal better as you want to label mice tissue.
This info may be useful (I have not used this Abs but info there may be suitable for you to decide)
thank you for the info. I am not interested in a specific isoform. I just want to use it to identify glutamatergic neurons in the cortex. So I guess a pan antibody should work fine.