Had the opportunity to run the Mauser 22lr 1911 through its paces, and it performed flawlessly. Only two complaints, both dealing with the sights: the rear sight has significant lateral "give" and cannot be fully tightened and aligned, and the front sight is plastic and could easily misalign or break off if the pistol is dropped or inadvertently knocked against a hard object. Mauser/GSG provides four alternate-height sights to adjust for elevation, but the micro allen screw and wrench make swapping them out during sighting a chore. The gun itself is solidly built and went through 100 rounds of CI 40 grain CP "red" without any misfires, FTFs, stovepipes, etc. Good weight, perfect grip, fun to shoot!