I thought that the 170096 shown in the SCSW was a myth, but it is true there is such a thing... sort of.

First off the SCSW lists the 170096 as "M-1006 9SH 3-1/2" GB DA SS Pcct"

The 1006 I found was a "Performance Center Classic Series". This is where the Performance Center takes left over parts, builds a pistol, and then billboards the slide with "Performance Center Classic Series". This has also been done with the 3953 and the 4567.

So here it is, 1 of 28 made per the auction site I found it on; definitely not a 3-1/2 barrel, but it does have the 170096 product code: