Load the Five-SeveN with 20 of those needle-nosed 5.7x28mm cartridges and you’re aiming 744 grams (1.64 lbs.) of Belgian bad-ass at your target. Insert 17 9mm rounds into a Glock’s polymer pistol and you’reschleppingnearasdammit two pounds of handgun. A fully-loaded Glock 17 with ...