Stag Arms has a lifetime warranty for the original purchaser.
I saw a repost of that somewhere, where they didn't have all the pretty pictures. The pictures makes it much more informative.One of the best links I know, and I'll give it to you for free.
So you want to buy an AR-15, huh? - Police Forums & Law Enforcement Forums @ Officer.com
You'd be surprised at how many manufacturers offer the lifetime warranty on certain models or otherwise.
Bushmaster carries only a one-year warranty.Stag Arms has a lifetime warranty for the original purchaser.