I am the guardian of a 24 ga percussion double shotgun made by I Funk of Suhl my FIL brought back from WW2 that is equipped with halfcock stalking safeties that release when the hammers are brought to full cock.

It's a very nifty & robust system that should prevent an accidental discharge by dropping the gun or having something strike the hammer & breaking the halfcock bent allowing the hammer to strike the cap. A nice & useful feature on any hammer gun, cartridge or percussion.