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Glock's pair of Gen4 pistols—the G17 (9mm) and G22 (.40 caliber)—upgrade the Gen 3 line with adjustable backstraps, a rougher-textured grip, double spring to reduce recoil and new slide serrations. Take a look at our gallery of the full-frame pistols introduced at SHOT Show. Then, read our "Arsenal" review of the pistols. This summer, look for Gen4 versions of the compact G19 and G23.