I understand some folks would always want a bill of sale on a firearm sale just to cover their rear, but do you ever really need one? If you're the original owner of a firearm and it was transferred to you on a 4473, I guess it'd be a good idea to have a bill of sale with the purchaser's information on there if you sold that firearm since it could be traced back to you in an unfortunate incident. I'm interested in selling a few items that I'm the original purchaser on and didn't know if I needed bills of sale or just make sure the purchaser had a current carry license. Opinions appreciated!