Hmm, I have in my notes that it came with Universal, Not made by. Unfortunately early on I did not cite where I got that information from.
Universal was in business 1962 to 1987 and many changes were made over that time. Early ones used USGI parts and later they had commercially made parts.
Universals Commemoratives were sold with with 5,10(15?) and 30 round magazines. According to one source. However I do not know how they are marked.
It seems the earliest questions about the PW marked mags were circa 2011 but may have been earlier. With that they most likely were not something sold with Universal.
*EDIT TO ADD* In CCNL 362 from Nov 2010 the PW Magazine was reported New In Wrap with a UPC bar code.
the UPC 8800270150031 pulls up KCI mags at Midway