No, they are not. I bought a Speck Ops folding stock for the Winchester 1200/1300 series of shotguns, for my Winchester SXP Defender. Upon trying to install the stock, it was obviously much different than the old 1200/1300 series.
ATI mentions a stock system with Winchester adapter for the 1300 and the SXP series, try calling them to see if you can buy just the adapter or the stock system, if that is what you are looking for.
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