Someone commented in a video to Mr. Hicks at Pax regarding the ability to have information stored with a rifle. Perhaps they meant the object could record who it killed or other data and that data would be stored on the server perhaps so that when players picked it up, the items history was available.
Just to build on that idea somewhat, what if you could just simply drag a knife to a wooden buttstock, hand guard or a wooden weapon and carve information in, similar to how the properties of the pen and paper work in game? This would allow you to record a small amount of information: kills, the weapons name, your name, etc. Add to the list until the character limit was reached and a new buttstock could be put for more info. The old one could be stored in a barrel and retain the info.