content: Mounted according to specs this aiming device will not keep accurate placement on a Glock 17. The front of the device has no mounting hardware. It depends soley on the trigger guard to support it from the rear, so when the housing is banged around either from drawing from holtster or slapping into your palm the laser housing goes way off center unsupported at the front. At 10 yards it is off by 2 feet! I would not wish to be caught in a home defense situation with my laser pointing at something my sights tell me I am not going to hit! This device for the Glock 17 to work correctly needs a better mounting system to stop the front of the device from shaking itself off center. My phone call and e-mail to Armalaser went unanswered. So much for customer support. Anyone want to buy a expensive cat toy???? Looking at Crimson Trace right now.