Efficient method of carrying extra shotgun shells by GG&G; As easy to install as changing a car tire; No modifications are required to the weapon for installation; Mounts solidly to receiver using provided steel trigger pin replacement bolts; Non marring backing plate will not damage the receiver's finish; Shotshells can be retained in base up or base down position; Durable, oil resistant, replaceable shotshell retention system; Manufactured from 6061 T-6 aluminum; Type III hard anodized black per mil-spec; Ergonomic design including lightning cuts for weight reduction