Anderson's .458 SOCOM Stripped Upper Receiver is machined from 7075 T6 Aluminum forging. This .458 Upper Receiver is machined to fit onto our standard multi cal lower receivers and features an expanded ejection port opening. This upper receiver comes in type III hard coat black anodize for extreme durability. This upper is also a great option for other large bore calibers like the .450 Bushmaster and .50 Beowulf.These upper receivers have been known to work with CMMG Radial Delayed Blowback 9mm custom builds.Add a plain or engraved port door + forward assist kit from the drop down menu. Choose one of our upper engraving graphics from the drop down menu.