Look if you ahve questions... go to the source. in this case ATF website.
No, provided the firearm is returned to the person from whom it was received.
[27 CFR 478.124(a) and 478.147]
From the NSF site
The aim of this article is to help every retailer keep complete and accurate A&D records for all firearms taken in for repair, whether it be just for cleaning or for return to the manufacturer for repair or replacement, and everything in between.
First, keep a separate A&D book for your repairs. It’s much easier that way.
Second, make sure that A&D book looks like (is formatted like) all your other A&D books. It’s required by the ATF regulations at 27 CFR 478.125(e), and by ATF Rulings 73-13 and 77-1.
Third, enter all required information in the repair book for every firearm taken in for repair that stays more than one business day. That is also required by the ATF regulations at 27 CFR 478.125(e), and by ATF Rulings 73-13 and 77-1.
Only firearms that are received, repaired and returned to the customer, all on the same day are exempt from the requirements discussed in this article. If the gun stays in your store overnight, ATF Ruling 77-1 requires it to be logged into your A&D record as an acquisition.
Your record of firearms received for repair must contain a complete description of the firearm – manufacturer, importer (if any), model, serial number, type of firearm (not type of firearm action), and caliber or gauge.
It must contain the full name and complete street address of the individual who brought
it in for repair and the date it was brought in.
When the firearm is returned to the individual who brought it in for repair, the disposition side of the record must again contain the full name and complete street address of the individual who picked it up and the date it was returned to that individual. I know this is the same information that you entered on the acquisition side of the record, but no shortcuts are allowed, even when the firearm is returned to the same person from whom it was received.
If the firearm is returned to the same person who brought it in for repair, no Form 4473 or background check is required because the law says this is not a “transfer.”
If, however, the repaired firearm is returned to anyone other than the individual who brought it in – a spouse, for example – both a Form 4473 and a background check are required. (NOTE: Per the instructions at item 11a on Form 4473, an individual picking up a repaired firearm for someone else does not have to answer 11a.)
Is an ATF Form 4473 required when a gunsmith returns a repaired firearm?
No, provided the firearm is returned to the person from whom it was received.
[27 CFR 478.124(a) and 478.147]
From the NSF site
Record Keeping for Repair Firearms
A Guide for Retail FFLs
Prepared by Harry McCabe, Former ATF Deputy Assistant Director and Consultant to the National Shooting Sports FoundationThe aim of this article is to help every retailer keep complete and accurate A&D records for all firearms taken in for repair, whether it be just for cleaning or for return to the manufacturer for repair or replacement, and everything in between.
First, keep a separate A&D book for your repairs. It’s much easier that way.
Second, make sure that A&D book looks like (is formatted like) all your other A&D books. It’s required by the ATF regulations at 27 CFR 478.125(e), and by ATF Rulings 73-13 and 77-1.
Third, enter all required information in the repair book for every firearm taken in for repair that stays more than one business day. That is also required by the ATF regulations at 27 CFR 478.125(e), and by ATF Rulings 73-13 and 77-1.
Only firearms that are received, repaired and returned to the customer, all on the same day are exempt from the requirements discussed in this article. If the gun stays in your store overnight, ATF Ruling 77-1 requires it to be logged into your A&D record as an acquisition.
Your record of firearms received for repair must contain a complete description of the firearm – manufacturer, importer (if any), model, serial number, type of firearm (not type of firearm action), and caliber or gauge.
It must contain the full name and complete street address of the individual who brought
it in for repair and the date it was brought in.
When the firearm is returned to the individual who brought it in for repair, the disposition side of the record must again contain the full name and complete street address of the individual who picked it up and the date it was returned to that individual. I know this is the same information that you entered on the acquisition side of the record, but no shortcuts are allowed, even when the firearm is returned to the same person from whom it was received.
If the firearm is returned to the same person who brought it in for repair, no Form 4473 or background check is required because the law says this is not a “transfer.”
If, however, the repaired firearm is returned to anyone other than the individual who brought it in – a spouse, for example – both a Form 4473 and a background check are required. (NOTE: Per the instructions at item 11a on Form 4473, an individual picking up a repaired firearm for someone else does not have to answer 11a.)