That was sarcastic, BTW. Fairly uncommon. The automatic-fire (not the sarcasm). I'm sure S&W will take care of you.
BATF agent, "I'm from the government and I'm here to help."
S&W has great customer service. I'll bet they take care of the problem without any hassle.
An individual CAN ship and receive firearms through the mail. The link you posted clearly states that. I took a rifle to my post office, declared it as a firearm, the postmaster inspected to be sure it was unloaded, and I shipped it to the manufacturer for repair. I've never attempted to ship a handgun.
There is some right and wrong here.
It is Post Office "regulation" that wont allow handguns to be shipped by a private citizen, not ATF Regulation. The Post Office used to do it, then they got tired of messing with it so they quit doing it.
Fed EX or UPS has no issues with shipping a firearm for repair by a private individual as long as it goes back to the factory or to an FFL.
Back on topic, +1 for taking the precaution of sending it back to the factory. Smith and Wesson's customer service is top notch.
Actually I do hold a SLED card, I am not an FFL, but I do have the FFL form given to me by my local FFL for sending and receiving a firearm.
My recommendation is to do your own research on what you can and cannot do where you live. Don't listen to every Internet expert's opinion and get yourself in trouble as a result, OP.
I've had a .40 S&W P99 since they were introduced (or right after the first Daniel Craig James Bond Movie!)
I have also had the "full auto" treatment. It only happens with cautious new shooters. I agree that it's a combo of a limp wristed shooter and a death grip on the trigger. I have tried to duplicate it but cannot.
BTW, I love this gun. I have Beretta's, Rugers, 1911's and this is by far my favorite.
I guess the P in P99 is what everyone does when the gun seems to rip off a burst