A'yep. They'll probably just annotate block 4H "Receiver Marked: Last name, City, State". That's how it was on the last few forms I did.
Also, I just looked at a Form 1 - See instruction 2J:
"Description of Firearm and Markings. (1) Item 4a. If you are modifying an
existing firearm, enter the name and location of the original manufacturer.
If you are creating the firearm, enter the maker’s name, city andstate.
(2) Item 4b. The types of NFA firearms are listed in the definitions; (3) Item
4c. Specify one caliber or gauge. If there is another designation, indicate
the designation in item 4h. (4) Item 4d. Show the model designation (if
known). (5) Item 4e and 4f. Specify one barrel length and overall length in
items 4e and 4f as applicable. Note: if the firearm has a folding or
collapsible stock, the overall measurement is to be made with the stock
extended. (6) Item 4g. Do not alter or modify the serial number of an
existing firearm . Enter the existing serial number or, if a new firearm, one
you create. (7) Markings: The maker is required to mark the firearm with
his or her name, city and state. All markings are to be in compliance with
27 CFR 478.92 and 479.102."