It would have to be made to match the slide...
Facts matter...Feelings Can Lie
FWIW the last couple of books I have read, both of the authors prefered a Glock 35 for carry. One was Tom Givens and the other Chris Sajnog.
My favorite .40 is my 5 inch STI because with a simple finish reamer it can become a 10mm.
My 2nd favorite is my M&P , 5inch slide from a pro model on a thumb safety lower from a 4.25 inch M&P. This with the new forward flat trigger from Apex is as close to a plastic hi-cap 1911 as I have found.
I am the owner of Agile/Training and Consulting
www.agiletactical.com
Bill,
So you're already have an MP? The 357 SIG M & P is out of production but if you're looking for one lawman supply in North Carolina has a bunch of trade ins. I know you're primarily looking for a 40 but, to steal a phrase from the tactical hobo, 357 SIG is a guilty pleasure.
My favorite .40 was the HK USP that I sold several years ago. I regret selling that gun, and it was accurate, reliable, and the DA/SA trigger smoothed out nicely for an HK.
If I were in the market for a .40, I would look at the P30 or P30L.