Ken,

Haven't seen anything on possible improvements to the action itself, but let me throw into the discussion the notion of adding something missing, subject to correction, in all American-made guns, boxlock or sidelock: intercepting sears.

They would add to the cost of the action, but I'm not sure by how much. Might ask Mr. Earle to cost out both with and without. That's assuming there's room to fit them in the basic Lefever design.

Must say I'm delighted that a 12 bore is possible and can fit on a 1-1/16 width (or even very slightly smaller) between firing pin centers.

Best, Tim