Corrected, it's been a while. All of these pistols have various names for marketing reasons and it gets confusing. Anyway...The FBI did not issue or adopt the S&W M&P 40. The FBI did adopt the 40 S&W and issued Glocks chambered in said calibre.
They did however issue S&W M&P revolvers at one time (S&W model 10)
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Firearms of the FBI: A Historical Overview - Inside Safariland
From revolvers to semi-autos, here’s how decades of innovation have changed FBI firearms and what that means for today’s agents.inside.safariland.com
