The Winchester 1911 was a. Known as 'The Widow Maker' the M1911 SL Autoloader was Winchester's attempt. Langlaagte Licensing Department. Wow 3.3.5a Engb Client. Are some marked '1911'? The serial number. The Winchester Model 1911 SL Shotgun was a self-loading, recoil-operated shotgun produced by the Winchester Repeating Arms Company from 1911 to 1925. It was Winchester's first autoloading shotgun, but design flaws kept it from providing competition for the autoloading shotguns made by Remington Arms and Browning Arms Company. Description and development. The Model 1911 SL (for 'Self-Loading') shotgun was developed in 1911 by Thomas Crossley Johnson for the Winchester. Nx216 Flash Reader Usb Device Driver.