Are there any legal ramifications to owning (or even ordering) an AR pistol upper in a home where other AR rifles are present, not being assembled? I have multiple AR lower rifle platforms, would like to order a few pistol parts, but not interested in completing a pistol until a later time. I would be fine with storing the pistol uppers in a different location such as a storage unit if that is okay. Also, has anyone ever grease packed their AR with cosmoline or anything like it? What would you recommend?