Yes, A & S Famars offers the doll's head extension with screw grip third fastener as an option. It's expensive. Late English Rigby boxlock DRs were screw grips as well as the current W. J. Jeffery boxlocks that Paul Roberts (who formerly owned Rigby) is building now. In both cases the actions are from A & S. Others may be building screw grips, as A & S sells a number of actions to the trade annually.
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