If their AOW's yes, but the stinger which isnt (As far as i know, ATF said because it bent into a gun shape, it was a gun) Probly isnt due to the exposed trigger and lack of trigger guard.
Keep in mind that since the Stinger is considered a pistol by the ATF, it has to be on Maryland's approved handgun list, if you want to buy one. This isn't so with an AOW.