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They are similar in size Matthias. The 40S&W is Height: 5.5" - Length: 7.3" - Grip Width: 1.20" and Weight (with Empty Magazine): 27.5 ozs. The 45ACP is Height 5.75" - Overall length 7.3" - Grip Width: 1.20" and Weight 30 oz (with Empty magazine).

Hi Matthias, The .45 is 4 inch barrel - Its Overall length 7.3" Height 5.75" Weight 30 oz (with Empty magazine) The .40 is Grip 3 inch barrel - Width 1.19" Overall Length 6.25" Overall Height 4.75" with compact magazine Overall Height 5.50 with X-Tension magazine Overall Weight 26 ounces with Compact Magazine/27 Ounces with X-Tension Magazine (with empty magazine)

the 45 is just a little Taller ( 5.75 inches to 5.5 inches ) and heavier (30 ozs to 27.5 oz)