To serve the huge base of AR15 owners who are fueling the growth of aftermarket accessories we created a master GUN DIY instruction manual. 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 barrel and everything in between. 18 Top Mods shows how to BUILD IT RIGHT.