Best deal on the web. It covers the original owner for mechanical failures for the lifetime of the firearm. Buds will repair or replace the item if un-fixable.

Supplemental Lifetime Gun Warranty Terms and Conditions
Budsgunshop.com warrants that any new or used firearm covered under our Supplemental Lifetime Warranty will be repaired, replaced, or refunded at no charge, subject to the following conditions:
This warranty applies only to the original purchaser.
If the firearm cannot be repaired, and no direct replacement is available, we will offer current retail value as a credit (amount to be determined by Budsgunshop.com) towards the purchase of any item(s) from budsgunshop.com /> This warranty applies to both new and used guns.
If a firearm is repaired, it may be returned directly to the customer. However, if a firearm is replaced with a new or used firearm, the customer must take delivery of the replacement firearm from a licensed FFL dealer. The customer may incur additional charges, such as transfer fees and background check fees, from the transferring FFL dealer. Budsgunshop.com is not responsible for these additional fees.
Budsgunshop.com will pay for all freight costs associated with a firearm warranty repair, replacement, or refund.
This warranty covers the firearm as originally sold by the Manufacturer and/or Budsgunshop.com, but does not extend to new or used guns altered or rebuilt after their original purchase. This Supplemental Lifetime Warranty does NOT apply to scopes or other accessories attached to the firearm.
Accuracy is NOT included in this Warranty.
This Supplemental

The "Limited Lifetime Warranty" Covers the original purchaser. They repair/replace if it breaks out of the manufacturers warranty period. The firearm also must not be altered for the warranty to be in effect as well. Details are here - budsgunshop.com/catalog/warranties.php