The Colt Delta Elite is a modified series 80 M1911 pistol chambered for the 10mm Auto cartridge. It was first introduced in 1987 by the Colt's Manufacturing Company.
Colt Delta Elite
Colt Delta Elite O2020 (First Generation 1987–2005)
Colt Delta Elite O2020 (Second Generation 2009–2015)
Colt Delta Elite O2020XE (Second Generation 2016-present)
The .40 S&W (10.2x22mm) is a rimless pistol cartridge developed jointly by American firearms manufacturers Smith & Wesson and Winchester in 1990. The .40 S&W was developed as a law enforcement cartridge designed to duplicate performance of the Federal Bureau of Investigation's (FBI) reduced-velocity 10mm Auto cartridge which could be retrofitted into medium-frame semi-automatic handguns. It uses 0.40-inch (10 mm) diameter bullets ranging in weight from 105 to 200 grains.
.40 S&W FMJ flat-point cartridge
Left to right: 9×19 mm Parabellum, .40 S&W, 10 mm Auto, .45 ACP
An expanded hollow point bullet (Winchester SXT "Black Talon", left) and an unfired hollow point .40 S&W cartridge (Speer Gold Dot, right)
Frontal view of .40 S&W cartridge, FMJ