Being that the 15-22 bolt catch is polymer and appears to have a specific tang that serves to lock the bolt back while fitting the 15-22 mag, has anyone tried upgrading the bolt catch to a mil-spec metal part? Will a standard AR bolt catch work with the 15-22 bolt and mag?

There are a number of 15-22 lower parts that appear mil-spec at first glance but are actually slightly different (safety, rear takedown pin, bolt catch). Really, the trigger group is the only standard mil-spec group of parts.