well, a pen gun would be a no-no. Pen guns are specifically exempted from the AOW exemption.
(8) Any other weapon ......The exemption provided in this subdivision does not apply to pen guns.
But other cool stuff should be ok. Cane and wallet guns. Flashlight guns would be ok. a Mini-Maglight gun might be getting close to the size of a pen gun. I wouldn't mind one of those deadly Cellphone guns.