Yeah, but if it is a mag designed for 556 I doubt ATFE is going to buy it is a ten round mag. Modify it ever so slightly for 458 socom use and it MIGHT fly. If you have a 458 socom upper of course.
$0 of an NRA membership goes to legislative action or court battles. Not a dime. Only money contributed to the NRA-ILA or NRA-PVF.
Of course, you could just donate to the Second Amendment Foundation
I was feeling pretty good, then I looked around and realized I am not swimming or on fire.