I have to fire up the big tanks in the next week or so.
For Gunsmithing purposes the Transfer/BGC BS does not apply, that remains unchanged. As long as the same party that dropped the item off picks it up no BGC/Transfer is required.
An individual can ship a firearm to a FFL/Gunsmith for repair purposes directly. The FFL/Gunsmith can ship it directly back to the individual with no BGC/Transfer required.