Ok. Sure. 98391. Now tell me what "city" I live in, where I will make the SBR, and your answer better not be the USPS station my mail comes out of, because I don't live in the city of that name (or any city).
The engraving of an SBR has nothing to do with a mailing address.
First things first...
1. You don't get to tell me what I 'better not do'.
2. No one has said that SBR engraving has anything to do with a mailing address.
3. No one has said that you have to live 'within the city limits of _____' to have that listed as the city where the firearm was constructed.
Now, on to the fun part...
Jaysus... the way you carried on it sounded like you lived smack dab in the middle of nowhere and more than a few miles from "y'all cain't get there from here." Now I'm just amused that you live somewhere that has a population density
More Crowded than where I live (>1,100 ppl/sq mi v. <900 ppl/sq mi.)
For that matter, I "don't live in a city" neither. No siree, them there 'city people' live on the other side of the road, that's where the 'big city' starts, I live out in the country on the lake side of the road. Must be a good twenny, maybe thutty feet before I'm "within the city limits".
98391's primary city is Bonney Lake, Washington, but also includes Lake Tapps and Sumner. Any letter addressed to your street address/route number and any one of the cities listed will reach your address. It also provides all the information the ATF needs to complete the application.
What you "better not do" is keep on confusing some perceived need to live within the city limits of a city in order to have that city listed as your residence.
I don't mind helping people, but my patience wears thin when someone is being deliberately obtuse.