ETA 5/8/14: for those of you that printed a copy of your form, I want to clarify a couple things that have been discussed on AR15.com several times:
1. You should've put your entity (trust/corp) in the Licensee/Permitee field and left the Trade Name field blank. The Licensee/Permittee name (and address) will show up in section 3b. However, you'll also notice that the entity name is duplicated in field 3a, the Trade Name. This is not a problem, it's the way EForms works.
2. Section 4j ("Is this firearm being reactivated?") will not have a mark in either "Yes" or "No". You were never asked this question when filling out the form. Multiple users with approved forms have confirmed this section is blank on their forms, and I've yet to see anybody say they were disapproved for this reason.
3. The entire back (page 2) of the Form 1 will be blank. This is the benefit of filing as an entity. You didn't have to provide photos (section 12) or CLEO sig and info (section 13). You also don't have to provide fingerprints. In addition to that, sections 10 & 11 will be blank, as you were never asked those questions. You weren't asked those questions because the entity is the applicant, and not you as an individual. Your entity can't be an illegal alien, can't be addicted to a controlled substance, can't be a fugitive, can't have been dishonorably discharged, can't have renounced its US Citizenship, etc. Same rules would apply to a paper F1, although a lot of people seem to check the boxes anyway. It is not required to answer these questions when filing as an entity, therefore you haven't done anything wrong resulting in unanswered questions.
ETA 9/25/14:
Although not specific to EForms, I'm going to post something that gets discussed often. The question is what needs to be engraved.
The answer most of the time is:
Name of applicant (either individual or entity)
City, state of where maker made the firearm (not necessarily home address, or even same city)
Remember, when it comes to looking at the statutes as a Form 1 applicant, you are a maker, not a manufacturer. A Form 1 is an Application to Make and Register a Firearm. There are a whole different set of forms/regulations/taxes to be a manufacturer.
Here are the statutes behind those requirements:
§ 479.102 How must firearms be identified?
(a) You, as a manufacturer, importer, or maker of a firearm, must legibly identify the firearm as follows:
(1) By engraving, casting, stamping (impressing), or otherwise conspicuously placing or causing to be engraved, cast, stamped (impressed) or placed on the frame or receiver thereof an individual serial number. The serial number must be placed in a manner not susceptible of being readily obliterated, altered, or removed, and must not duplicate any serial number placed by you on any other firearm. For firearms manufactured, imported, or made on and after January 30, 2002, the engraving, casting, or stamping (impressing) of the serial number must be to a minimum depth of .003 inch and in a print size no smaller than 1/16 inch; and
(2) By engraving, casting, stamping (impressing), or otherwise conspicuously placing or causing to be engraved, cast, stamped (impressed), or placed on the frame, receiver, or barrel thereof certain additional information. This information must be placed in a manner not susceptible of being readily obliterated, altered or removed. For firearms manufactured, imported, or made on and after January 30, 2002, the engraving, casting, or stamping (impressing) of this information must be to a minimum depth of .003 inch. The additional information includes:
(i) The model, if such designation has been made;
(ii) The caliber or gauge;
(iii) Your name (or recognized abbreviation) and also, when applicable, the name of the foreign manufacturer or maker;
(iv) In the case of a domestically made firearm, the city and State (or recognized abbreviation thereof) where you as the manufacturer maintain your place of business, or where you, as the maker, made the firearm; and
(v) In the case of an imported firearm, the name of the country in which it was manufactured and the city and State (or recognized abbreviation thereof) where you as the importer maintain your place of business. For additional requirements relating to imported firearms, see Customs regulations at 19 CFR part 134.
Those are the general guidelines...then the ATF clarified for NFA items:
The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) authorizes licensed manufacturers and licensed importers of firearms, and makers of National Firearms Act (NFA) firearms, to adopt the serial number, caliber/gauge, and/or model already identified on a firearm without seeking a marking variance, provided all of the conditions in this ruling are met. Licensed manufacturers seeking to adopt all of the required markings, including the original manufacturer’s name and place of origin, must receive an approved variance from ATF. ATF Ruling 75-28 is superseded, and ATF Industry Circular 77-20 is clarified.
Held, pursuant to 27 CFR 478.92(a)(4)(i) and 479.102(c), ATF authorizes licensed manufacturers and licensed importers of firearms, and makers, to adopt the serial number, caliber/gauge, and/or model already identified on a firearm without seeking a marking variance, provided all of the following conditions are met:
1. The manufacturer, importer, or maker must legibly and conspicuously place on the frame, receiver, barrel, or pistol slide (if applicable) his/her own name (or recognized abbreviation) and location (city and State, or recognized abbreviation of the State) as specified under his/her Federal firearms license (if a licensee);
2. The serial number adopted must have been marked in accordance with 27 CFR 478.92 and 479.102, including that it must not duplicate any serial number adopted or placed by the manufacturer, importer, or maker on any other firearm;
3. The manufacturer, importer, or maker must not remove, obliterate, or alter the importer’s or manufacturer’s serial number to be adopted, except that, within 15 days of the date of release from Customs custody, a licensed importer must add letters, numbers, or a hyphen (as described in paragraph 4) to a foreign manufacturer’s serial number if the importer receives two or more firearms with the same serial number;
4. The serial number adopted must be comprised of only a combination of Roman letters and Arabic numerals, or solely Arabic numerals, and can include a hyphen, that were conspicuously placed on the firearm; and
5. If the caliber or gauge was not identified or designated (e.g., marked "multi”) on the firearm, the manufacturer, importer, or maker must legibly and conspicuously mark the frame, receiver, barrel, or pistol slide (if applicable) with the actual caliber/gauge once the caliber or gauge is known.
Held further, licensed manufacturers seeking to adopt all of the required markings, including the original manufacturer’s name and place of origin, must receive an approved variance from ATF.
So...the quick list of required engravings:
1. Serial Number
2. Model (if designated)
3. Caliber
4. Name
5. Location