If you have an ar15 type weapon, read or reread it, if you think you will ever have one read it. If you think you are one of the worlds experts in ar15, still read it. It covers all the basics, like one of the dummy,s books, and the information on setting the battle 0 and using it is priceless and given the propensity for everything to fail, or if you have a pick up or otherwise obtained weapon, it is really nice to be able to use the backup sights effectively. If you have seriously applied yourself to the Appleseed training program with a .22, you should be able to effectively use an ar15 with the backup or battle sights with a few rounds of familiarization firing. With this resource and the Appleseed system any one not familar should become a semi proficient with the weapon with minimal use of 223 ammo.