I agree that the design of the lifter seems superior to the top action. It is natural motion to open the gun. I would also agree that it must of been "Market pressure" as all of the English makes went to top action as well. Most of my favorite/special Parkers are lifters.
Some English guns had a thumb break design which was incorporated into the trigger guard. I have an 1866 Purdey that has it and that is also a nice design.
A Remington Whitmore has what it also called a lifter action. Though it is done from what looks like a toplever, but it pushed up to open the barrels. I have one in 10 gauge and like that design is well. Would love to find a nice one in 12 gauge.
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