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So what is it, and what were the problems with the design?
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Whoops, left that part out
It's a Winchester Model 1911 SL. When John Browning developed what would become the Auto-5/Remington Model 11, he initially took the design to Winchester for production. Because he wanted a percentage royalty rather than a flat payment for the design, they were unable to work out a deal, so Browning took the design to FN. Once the Auto-5 hit the market, Winchester realized they needed something to compete, so they enlisted T.C. Johnson (who went on to design the Model 12, among other things) to essentially copy the Auto-5 without infringing on any of Browning's patents.
One of the patents Browning held was for the bolt handle, so they resorted to putting a knurled ring on the barrel, which allowed the shooter to manually cycle the action (since it's recoil-operated) by grabbing the barrel and shoving it back into the receiver.
While this, in and of itself, isn't necessarily a bad design, many people chose to plant the stock in the ground and lean over the barrel while cocking the gun, with predictable results in the event of a slamfire. This is easily mitigated by both safe gun-handling and the use of the bolt catch.
There were a number of other mechanical shortcomings due to the nature of engineering the gun to avoid Browning's patents, resulting in numerous modifications throughout the gun's production, and ultimately a "recall" by Winchester in which many of the shotguns were replaced by the company with Model 12s.