Sorry to hear that.
While I have no problem repairing airsoft guns after a reasonable amount of use, and have just bought an AAP-01C on that basis, I'd say broken-out-of-the-box is more of a case of haggling over whether you or the retailer is paying the return fee. If you don't like the answer, you can just start down the chargeback route with your payment processor, which can result in a retailer suddenly remembering your consumer rights.
If you do want to investigate, I'd also suggest doing it with their agreement and under their guidance. It may be something simple that they can send you a part for, but if you go poking and prodding around, it might result in a warranty rejection.
One thing, can you see any signs that you've been sent a "pre loved" gun? It wouldn't be the first time.