The Winchester Model 1911 SL Shotgun competed against a shotgun that remained in production until when?
Winchester Model 1911:  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. Browning Auto-5:  It was the first successful semi-automatic shotgun design, and remained in production until 1998.
1998