All of the previous info is good. I use only paper records (several copies) with pictures of L/R sides. For revolvers, I put my business card with contact info under the grip, for rifles/shotguns it goes under the recoil pad. As most of what's left of my collection is of sentimental value or family hand-downs, I have a complete written history of that firearm, so when the time comes for the kids to be disposing of my estate, they will understand why I kept that old rusty single shot shotgun, etc.