I had a set of Tier One rings where the recoil lug sheared off because insufficient material was left between edge of recoil lug and bolt screw hole - clearly a design defect. I contacted them and expected to be offered a replacement set as they had failed in normal use but was told to go and whistle. My son approached them with a problem with a bolt (can’t recall the specifics) and was initially told to go elsewhere but eventually was given a replacement after getting a bit irate. Sadly I would like to support them but their attitude to customer service stinks so I now avoid using their products entirely as there are many other businesses that will look after their clients.