We developed this Parts Reference Guide for use in our Armorer’s Courses, and found it so popular we decided to offer it to all. Every part of the basic AR15 rifle is shown printed in full color detail and then laminated for durability. The back side shows full size images of minimum and maximum length action (buffer) springs for both rifle and carbine, as well as both the rifle and carbine buffers for easy identification (both sides are shown in this image). 14″ x 8.5″ size. Makes a great gift, or an indispensable reference for the gun workshop wall.