I obtained a second MK1 last year, serial G31282, which has a rounded thumb catch instead of the more typical straight sided examples.

I have not been able to find any information on this catch apart from one reference to a "duck bill" catch. Looking on the Vintage Airgun Gallery (what a superb reference tool) these rounded catches seem to appear mainly on the .177 Club Airsporters though there is one shown on a .22 like mine. I also note that most of the examples with the rounded catches also have the BSA imprint on the stock - again, like mine.

Does anyone have any information about this alternative shape of catch? Was it only fitted to special editions or did it find it way onto a variety of Airsporters?

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