How to Add your USCIS or A Number to your ATF eForm Tax Stamp Application
If you are an alien, you will need to enter in your I-94 Number, USCIS Number or AR Number. You can add your USCIS Number or "A" Number into your ATF eForm application on the Applicant page under the Maker's Questions. Box 13 is where you enter in your USCIS Number. The box will not directly accept your number. That field requires you to enter in text before you enter your number.
To enter in your USCIS Number, you will need to start by typing "A" and then your number. See below example.