Gen 4 Glock 20 

Since its introduction in 1983 in the star-crossed, CZ-75-inspired Bren Ten, the 10mm Auto cartridge has followed an all-too-familar trajectory curve in terms of popularity. It has gone from “The Next Big Thing” to cult status, having been pushed along the way by the almost-unprecedented acceptance of the .40 S&W.

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However, the 10mm Auto is still considerably more potent than the .40 S&W. And chambered in the Glock 20, it represents about the upper limits of ballistic potential you’re going to get in any real-world auto pistol.

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