Durable, oil resistant, replaceable shotshell retention system; Mounts to receiver using steel trigger pin replacement bolts (included); Non-marring backing plate; Shotshells can be retained in base up or base down position; 6061 T-6 Aluminum Construction; Type III Hard Anodized Black per Mil-Spec; Ergonomic design including lighting cuts for weight reduction; All edges have been round for shooter's safety