I got serious warning bells here!!!!!!!!!!
THESE MAGS ARE PROMAG.
The original poster mentions steel, parkerized finish, but does not mention manufacturer. Some posters have responded, and requested manufacturer name, but response has been slow.
The pics provided depict a magazine that is 100% identical to a few ProMag aftermarket mags I've purchased. Fit and function has been good, with no problems.
However, please note, the finish depicted in the pics provided is painted. The stamped metal baseplate, with the stamped 'fold' visible through the basplate is indicative of the same ProMags I own.