Combat Application Tools, Inc. P.O. Box 1377 Douglas, Wyoming 82633 offers a 100% MONEY BACK GUARANTEE on all of our tools. If you don't like the tool for any reason, send it back for a FULL REFUND. If you break it, send it back for a NEW TOOL.
CAT M-4 Tool Demo
Download the instructions here
A great tip from our friend MM at Military Morons.com: Turn the bolt inside the scraping chamber first. Then, hold it against the outside of the scraping chamber and turn it again to get the last bits of carbon and grit.
Please visit MilitaryMorons.com, it's a great web site.