I havent heard a thing. I believe they have to shoot a 1" group before they leave the factory. The biggest pain was the mounts. I hate the ones that came with the gun, and there are few available. the best I found are Talley bases and rings. Rock solid. The Warnes hung way over the edge of the dovetail and so did the one piece integrated Talleys. I finally went with the steel bases and rings. So far so good, but we'll see how well is shoots.