Real Avid’s Master Series Top DIY AR15 Mods “Every Owner Should Know!”A definite page turner for the DIY’er in you!! A complete 82pg glossary and break down to get to know your AR15.This booklet includes: The history of the AR15 Platform Operating Systems Explanation of the differences between .223 & 5.56 Common Cartridges in the AR15 A Break Down of the Tools you’ll need to Modify your AR15 Procedures What is Headspace & Why is it so important? Upper Receiver/Barrel Modifications Lower Receiver/Stock ModificationsAnd much more!!