I have two 81DL, one 80DL, and one JC Higgins 42dl. I am trying to date these 81 rifles. The 81's have been narrowed to post war (1945-1954) I believe. Plain Bullseye walnut stock, not Monte Carlo or Semi Beavertail. Ballard style rifling. One has rear 12r Peep sight, one has standard rear leaf sight. Both have the two screw hooded ramp front sight. New style safety, new style trigger, new style bolt, aluminum feed tube. I am thinking that the "New style" (specifically the curved, two screw, front ramp sight) puts them closer to the 1950 to 1954 period maybe? Is there any information available that indicates when the "new style" parts were put into production? There are 3 variations of rear leaf sights, and 3 variations of the front ramp style sight for these guns. Knowing the release dates would help to narrow that 8 year gap. I love the old ballard rifling, very accurate, and for me, the hefty solid feel of the old Marlins just can't be beat. I know that you can take a mix of parts out of a pile of these guns and put them together randomly and end up with an excellent shooter, but these 81's are a little special to me and I would like them to be as correct as possible.