I have an older LW 9mm conversion barrel in my P80 G23 build. The barrel hood is not marked with the caliber. So, essentially someone can pick up the pistol and assume it is a .40 cal due to its markings, when it really is a 9mm. My .300 blackout pistol is clearly marked as to it being a conversion , as is my G22 project. Any ideas how to mark the hood? I have a set of standard steel stamps, like what you would use to label keys, but I do not think it would due a decent job on a hardened steel barrel.