You have just encountered one (of many) confusing interpretations of NFA.
When I read NFA, my understanding is that if you are registering an existing firearm that already has manufacturer info on it, there is no need to put Joe Blow, Winchester TN.
Now, you call NFA branch on any given day and ask that question to 10 people, 5 may tell you that you dont have to engrave your personal info.
The other 5 will tell you that you DO have to engrave.
Wait 3 days and call back with the same question; different answers...
While I personally feel that the law does not require your info to be engraved, we recommend it.
(actually, we recommend new receivers on Form 4s, but thats a different story)