Just want to give everybody a heads up. First off, the gun should've been right from the git go. I'm not sure how old mine is and can't speak to current models. That said: Diamondback's customer service was great.
I emailed them about my trigger reset issues and multiple failure to feeds in all magazines. Cheri responded to my email. According to her, their gunsmith said to send me all the guts of the gun. She sent new trigger assembly, new mag springs, new mag followers, and new barrel. I put all the parts in last night. The new trigger pull is shorter and lighter. I do not like that. However, IT WORKS! I went to the range tonight and put 200 rounds through the gun. I had one failure to feed. If this performance keeps up for a couple more range session, I think I'll put the gun into service.
The new trigger assembly is beefed up from the old. The transfer bars (correct term?) do not have the holes in them. They look slightly thicker than the old ones too. The new mag springs seem to have a couple extra coils and have a noticeably higher feed pressure (this does cause more effort to work the slide on a full mag). I can't really tell the difference in the old followers and the new except for the new are orange. The new barrel has a much wider/smother feed ramp.
Overall, despite the shorter/lighter trigger pull, the overall performance of the weapon is now much improved. It's improved to the point that I think I'm now going to pick up a couple more of them. I hope whatever I pick up works out of the box, but I'm confident that Diamondback will work with me to fix any problems if they don't.