I too was happy to see the S&W M&P at number 3. I bought the S&W M&P 357sig compact a few months ago. That brings the handgun collection up to 5. Long gun collection stands at 6.
I wonder if this list is referring to the classic S&W M&P revolvers, from which the new M&P semiauto line takes its name? The new series is a Glock beater, however.
Anyway, since moving to the Free State of Arizona 4 months ago, I've acquired an M&P 9mm compact, a Sig Sauer P238, and a S&W 686p with a Performance Center trigger job (my favorite!)