Machined Aluminum Forgings 7075 T6 Hardcoat Anodizing: MIL-A-8625F, Type III, Class 2 BCM Milspec Receiver Extension Staked M4 Lock Nut BCM QD End Plate USGI H Buffer (1 GI Tungsten, 2 Steel) BCM Trigger Guard Low Shelf for RDIAS installation Low Shelf for Accuwedge use Un-notched Hammer compatible with 9mm use Fire Controls marked SAFE and SEMI M4 Mil-Spec Stock Mfg: Bravo Company