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. Match this Upper with one of our Lower for a perfect fit.