I had the same problem, I requested the RMA, but it was a few days before they sent the email. If you can find a part number, Smith and Wesson would send you what ever you needed, but I guarantee you, you won't find a single part number anywhere for a Shield 9 or 40. Just be patient, they will send you an email with the instructions to send your gun back. Had it been any other firearm but the Shield, you could have found a part number and they would have sent it to you. Per the customer services reps that I have spoken to, they don't have access to the parts list yet because the gun is still fairly new. Again, just be patient, I know from experience that having to send your new gun back can be frustrating, but Smith and Wesson took care of me. One other piece of advice that I was told on this forum, when you send your gun in, don't send the magazines with it. When I got mine back I was pleasantly surprised with new magazines. Good luck!