Update:
A new mag tube has been sent out. As per my request with my initial contact, all the emails were forwarded to a supervisor, who called this morning and left a message.
I returned the call, and she explained that because of the production line assembly they do occasionally get faulty components and it sounds like I got a bad spring. She checked to confirm a replacement had been sent, and also confirmed that their springs should not fail from simply keeping the magazine loaded. I asked what to do if the new one fails, and she said to just call her again.
Now, that is the level of service I expect from Henry.