I just read an article on Hornady's website comparing the Critical Defense to the Critical Duty round. For instance, in 9mm the Critical Defense uses a 115 grain bullet optimized for "short barrel" handgun velocities. It is not loaded much above the 115 grain target loads you can buy at Wal-Mart. In other words, it does not have a particularly high power factor. Has anyone tried these in a Gen 4 Glock 17/19? It seems to me like the Critical Defense and the Gen 4 Glock may not be a good combination.