Was going thru the box of assorted gun stuff that doesn't get safe space and decided it was finally time to figure out what the correct story for these mags. My father had a Mac 10 (best recollection) in the early to mid 80's and I found these when I was dealing with his estate years ago, its time to find them a new home but I need to see if anybody can help identify these as I have not seen anything exactly them. Any help is appreciated.