Milwaukee Magnum Hammer Drill
If the chuck is completely jammed, you can replace it. If its locked but open, then you can remove the screw holding the chuck with an allen wrench. It's going be be tough because it will be secured with glue, such as loc-tite, and it will also be a left handed screw. So be sure to turn clockwise to unscrew it.
You can buy the part at this website, or at a milwaukee service center:
http://www.ereplacementparts.com/12-chuck-p-140621.html
It's a little pricey, but better than buying a new drill. You should also be able to have a service center put the part on for you, if you don't feel comfortable taking it apart.
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