If you can't read plain English, such as that contained in 26 USC 5842, 26 USC 5861, 26 USC 5871, 26 USC 5872 (a), along with 27 CFR 479.11 & .102, pay a lawyer to do it for you.
Yes, if you make a NFA firearm, you must mark it with the name of the making entity, and its city/state.
Y'all do...