It is a pretty common accessory and it takes 4mm BB's instead of pellets and berdan primers similar to the GP11 ones. Lienhard made these for the Swiss rifles as well as the pistols and they even made them for military issue for training with the SIG 210 pistols.
Guisan. 
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Fight to your last cartridge, then fight with your bayonets.
No surrender. Fight to the death.
--Gen. Henri Guisan, Switzerland, July '40
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