I am the Coordinator were the incident with the Model 67 barrels took place. We have a batch of Model 13 S&W that must be older than creation and have fire probably over 60,000rounds with no failures at all. We acquire the Model 64 in 2008 and had four barrels fall off. In 2010 we acquire the Model 67 and two barrels failed. Will advise on the factory response.