Glad to hear you will be OK. I would flinch every time I pulled the trigger for the next year if something like that happened to me.

Any idea what part of the gun hit you between your eyes? I thought most of the time when a polymer gun gun gets blown up the debris goes down the magazine well and grip, not back towards your face.

This was not S&W's fault and it would be hard for them to tell what parts may have been stressed but not completely broken. You can call and ask but given the price of Shields these days I would suspect they will tell you to trash the gun and buy a new one. The company that sold you that ammo owes you a new gun. Contact them and offer to send the remains of the gun and defective round. Hopefully they will do the right thing and pay for a new gun. And some bandaids.