That's a heartbreaking story, Gary, and I hope your friend and his wife pull through okay. From what you say they're fighters and will get through this.
As regards the rifle, most things can be rescued and I hope the mission goes to plan. First step will be to strip and clean and assess the damage and see what needs to be done. Would your friend be able to maybe do the strip himself with some guidance or will it need to go to somewhere like Doctor Nick's?