I did an eForm 1 for my recently purchased Sig MPX this passed Tuesday. I used a buddy's approved form 1 as a guide for OAL information, and found myself entering "mpx" as the model.

Fast forward to this weekend when at my local shop, someone mentions that their efiled Form 1 for an SBR'd MPX was disapproved because it didn't have "Sig MPX" in the model info. This has me worried that mine will get kicked back because of this as well. This got me to thinking, would anyone recommend emailing in to cancel the Form 1 (according to what I've read, I can do this by using the "ask the experts" link on eforms) and submit a new form with "sig MPX" in the model box with a picture of the receiver attached, or just wait and see if I get an examiner who will approve it?