Hi Steven and welcome. One year initially for material and workmanship defects, then Lifetime warranty to the original owner kicks in. Just remember to register the firearm with Smith and Wesson within the initial 30 days of purchase. Cheers, stay safe and enjoy!

Hi Steven, Smith & Wesson firearms are warranted to be free from defects in material and workmanship. Any such defects of which Smith & Wesson receives written notice within one year from the date of purchase by the original owner, will be remedied by Smith & Wesson without charge within a reasonable time after such notification and delivery of the firearm as provided below.
.
Smith & Wesson’s Lifetime Service Policy begins after the warranty period has expired. Smith & Wesson will repair, without charge, for the lifetime of the original owner, any Smith & Wesson handgun purchased on or after February 1, 1989, and any M&P series rifle that is found to have a defect in material or workmanship. Eligibility for this Lifetime Service Policy requires returning the printed Product Registration Card within 30 days of purchase or registering the purchase online within 30 days of purchase at smith-wesson.com.
The Lifetime Service Policy covers functional defects; it does not include the firearm’s finish, grips, magazines or sights.

1 year full warranty the lifetime service "Smith & Wesson’s Lifetime Service Policy begins after the warranty period has expired. Smith & Wesson will repair, without charge, for the lifetime of the original owner, any Smith & Wesson handgun purchased on or after February 1, 1989, and any M&P15 series rifle, that is found to have a defect in material or workmanship. Eligibility for this Lifetime Service Policy requires returning the Product Registration Card within 30 days of purchase. The Lifetime Service Policy covers functional defects; it does not include the firearm’s finish, grips, magazines or sights. The Lifetime Service Policy is in addition to and not an extension of the Smith & Wesson Warranty. This warranty gives you specific legal rights. You may also have other rights that vary from State to State."