Bought a mag, comes in a brown paper package, says 'mil-dtl-117h'. 'Ty.2cl.cst.1' The bottom of the mag says '19200 assy 5508694 mfr. 30745' It's a black 7 rounder. I don't know if its mil surplus, or a knock off looking to be mil surplus. It's almost identical to my factory kimber mag. Any one know about these? Are they any good? Thanks in advance.