Jeff,
Here is a “late” lifter made in 1893. This was part of 3 gun order and it looks like all 3 guns had the same specs. From the research I have done, this one(the last serial# in the 3 gun order) appears to be the last lifter made with a straight stock. It is a heck of a 12 gauge on a 3 frame with 32” barrels weighing in at 10 pounds.
Here the original thread when I first got the gun, I have decided to leave the gun as is. Looking through the pictures makes me want to go shoot it the gun this weekend:
http://parkerguns.org/forums/showthread.php?t=23250