Disassembling, scraping, cleaning and lubricating information at a glance. Now AR15 know how fits in your pocket. The AR15 field guide helps shooters maintain critical moving parts that affect the AR15 reliability and performance. Coated pages are oil and solvent resistant. On the bench or in the field, the AR15 guide gives shooters the right information fast. It's detailed enough for the home, workshop and small enough to carry in your range bag.