Call S&W and they will tell you how to go about shipping it back. They will pay for it if it is a defect in the rifle. Good luck.
How can I get my S&W handgun repaired?
Please contact our Customer Support Center for instructions on how to return your handgun for repair: 1-800-331-0852 (Inside USA) 8:00 a.m. to 8:00 p.m. Eastern Standard Time (Monday - Friday). Customers outside the USA may contact the International Warranty Service Center nearest you.