One of the benefits in using a Gun Trust is that you are able to submit electronic applications with the new ATF website. This is possible because a Gun Trust does not require a CLEO signature nor fingerprints. Currently only Form1s can be submitted electronically, but Form 4s should be back online soon. It is important to fill out the application correctly as there is not a way to correct mistakes that are made like with the paper forms. A mistake in the past would have put your application in the back of the line, but not any more.
If you make a mistake on an ATF eform (http://www.atfonline.gov) there is a way to submit a correction without going to the end of the line.
Once you receive the notice that your eForm has been rejected, you will receive a refund of the application fee in around 10 days. You do not have to wait for the refund to be processed to resubmit a corrected application. You can pay the fee again while waiting for your refund or wait for the refund and them resubmit the application.
Once you submit your new application send an email to Ted.email@example.com and include the control number of the rejected application and the control number of the new corrected eForm and the application will be reprocessed. This should decrease the time for the approval process on the corrected eForm.