This tool is excellent and I recommend it.I used it to install front and rear sights on an M&P 2.0, which had previously given me so much trouble to remove that I had to go to a gunsmith. It’s well made, feels and looks solid and it is fairly straightforward to use. Make sure you read the instructions and double check your alignment before committing, because there is the potential to do some damage, this is tool is strong.Aside from the additional blocking pads that you can use depending on the shape of the gun slide, and the handy ruler at the top which helps with centering, the biggest advantage is that it fits a standard 2½” vice (actually only needs about 2″ clearance), which means it will hold everything nice and steady and free your hands and attention for a better job at the gun sights. Operation is safe and easy once you set everything up properly, but it’s not difficult, and amazingly it just works! You may want to lubricate the inlet for the sights before insertion, the tool does make some worrying noises under strain, I moved back the pusher and then forth again to avoid exerting too much pressure for too long, and it worked.It does however have a little design flaw in my opinion: the bottom block, used to place it in a vice, has the top corners rounded as shown in the picture: this means that you can’t get a proper flat grip against the vice unless you raise it a bit, which makes it less steady. It may give more solidity to the frame, but I think it should be a proper 90° angle in there.Secondly, and that is the biggest flaw, the thread on one of the vertical bolts was damaged in two places, as shown in the picture, so much so that I couldn’t screw the nut further down. I had to scrub the groove several times with a flat screwdriver to make it better, and then insist with the nut back and forth with oil until it finally let it through – just as well or I would have not been able to use it. Being the most important part of the tool, I think Sporgain should make sure all threads are sound from top to bottom before letting out the tool from the factory.Apart from these two (minor) flaws, the tool is a phenomenal piece of equipment at a very good price, especially if you plan on changing sights more than just once: saves you time and sorrow! [...]