I had one scope problem. I had a Thompson Center 2.5X hand gun scope for close to 20 years. In my younger dumber days when I used to load my handgun rounds max + a few percent, I used that scope on Contenders, Ruger 44 mag, and a 357 Smith & Wesson. I pretty much beat the heck out of it. Finally what looked like a piece of seal appeared in the view of the scope. I sent it back to Thompson Center, and they sent me a brand new 4X scope at no charge. From my experience, they stand behind their lifetime warranty.