Here is a 2012 Post by Gunhacker:
Several years ago I bought a unique 4006 that lettered only as a 4006 Performance Center Production, shipped to Lew Horton. I emailed LH Distributing about it and got a reply back saying that it was 1 of 4 total that they distributed.
The S&W factory records could not verify it, but I was told by the previous owner that only 12 total were made, and they were supposed to be the 4006 IDPA. But .40 S&W is not at all a good caliber for IDPA, with 9mm being the majority of the pistols, I guess it never got off the ground.
One of the things that has been a mystery to me is how the grip fits the frame. Unlike a regular 4006, the cutout in the frame that the bottom of the grip fits in, is wider so there is a space on both sides of the grip between the frame.
A few days ago I was doing a search for some 3rd gen parts and in the results was a hit from a place called Power Factor Shooting, clicking on the link I got a surprise.
Listed as a close out/discontinued item was a Performance Center magwell. I ordered one and it arrived today... I just spent the last few hours hand fitting it, and now I know what the heck those spaces are for
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Conrad
SWCA #1830 SWHF #222