The classic S&W Military & Police revolver. It has been made with only minor design changes for over 100 years. They were made in blue and nickel finish. 2, 3, 4, 5, and 6 inch barrels. Round or square butt grip frames.
This one was made in the 1970s. 4 inch barrel, blue, square butt grip frame. The most common configuration of the M&P revolver. Made in the 1970s.
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