C - Products 1058041175CPD : 10rd 458 SOCOM stainless steel magazine matte black finish, black follower SS spring CPD Plate.The .458 SOCOM DURAMAG SS is a purpose built .458 magazine right from the factory designed to be a no hassle solution to feeding these large caliber cartridges. Combining DURAMAG\'s T-360 coating with a single stack advanced geometry follower and a big bore specific Everflex spring, this magazine will be your go-to.