Love the AR big bores but your magazine can't handle the sheer power or feed these rounds the right way? 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, these magazines will be your go-to. Do yourself a favor and get an American-made .458 DURAMAG built for one job: to feed 10 big-bore rounds properly every time.