Real Avid Top AR15 Mods Instructional Book Black 18 Mods AR15. Its packed with easy-to-follow photo illustrated step-by-step how-to-do-it directions for the 18 most popular modifications for AR15s. Written and edited by professional armorers this authoritative book gives users the confidence and know-how to tackle everything from a simple sight install to the more challenging changing out of a barreland everything in between. 18 Top Mods shows how to BUILD IT RIGHT. Specifications for Real Avid Top AR15 Mods Instructional Book: Manufacturer: Real Avid Package Type: Polybag Package Contents: Real Avid Top AR15 Mods Instructional Book Real Avid AVTOPMODS: Top AR15 Mods Instructional Book Black 18 Mods AR15