I bought a MGW sight pusher for Glock pistols a few weeks back, because I own multiple Glocks, and I wanted to be able to install my own sights. My boss was shooting low with his Glock, and after lots of testing with other Glocks of the same model, he decided his gun was the culprit and not his grip. He ordered a replacement rear (plastic) sight that was slightly taller than the factory sight in hopes that this would raise his POI. Since I just dropped roughly $100 on a sight pusher, I offered to get together after work at the range and get his new sight installed. I did my best to follow the instructions that were included with the pusher. It said for removal to move the sight out from left to right (since presumably the right side of the dovetail is the wider side). And then when installing the new set to drift it on from right to left. We removed the factory plastic rear sight, but in doing so the sight did not come out unharmed. It was mushed and deformed, and really the plastic was just ripped off of the metal base-plate which remained firmly in the dovetail. We both realizes what this meant. We figured it meant that we would get the same deforming results when installing his new plastic sight. I told him that even though his new sight was likely to get destroyed, but we could try if he wanted to. Since the new sight only cost $5, he decided to give it a shot. Well, needless to say, it didn't go well. Are we doing something wrong or are sight pushers NOT meant for plastic sights? How does Glock get them on? He just informed me that he ordered a set of (metal) Trijicon night sights, and that we could get together to install them as soon as they came in. What should I know when installing this new set? Should I cover the sights with anything before pushing them on so as not to mar the Trijicon logo or the metal? Can anyone give me advice on the proper way to install Glock sights with a pusher? This would seem like common sense, but after witnessing the destruction of two plastic sights, I am beginning to think that maybe there is something I am not understanding. Thanks so much in advance!