Presuming you are talking about a US milltary carbine or mil spec carbine, you must first drive out the pin that runs sideways through the front sight. It may help to first soak the pin area with WD-40, Kroil, or other similar product. Then find a correct size punch, preferably one that is fairly short and drive out the punch. I keep two punches for this purpose. The first a very short one to start the pin moving and a second longer one to finish driving the pin out once it has started moving. Driving out the pin is usually the hardest part of the project.
After the pin is driven out, the sight is either pulled off with a special puller tool or if you are lucky you may be able to drive it off with a block of wood or punch (if you don't care if you mar the old front sight). Clean the surface and lubricate the surface before driving the new front sight on. Drive the front sight on until the hole for the pin lines up perfectly with the cut out portion in the front sight key which you will have observed after removing the old front sight. There also is a very nice tool to help drive on the front sight without maring it as well. If this is the only time you are likely to replace front sights, it may not be worth buying the tools. If you do it more than a time or two, the sight puller and installer tool come in real handy.
You can do a little math to figure what the front sight height should be or just very slowly remove a little material until the group center is where you want it.Information
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