If by 'ladder rear sight' on the carbines you mean the flip up open rear sight with an open rear notch showing when in the down position, and a short sliding vernier in the raised position,,,that was standard on the 92, 94, 86 carbines through WW2.
After WW2 they changed over to the open rear sight on the 94carbines.\
There was no more 92 or 86. The rifle form of the 94 was now the Model 64.
There's probably a transition period where either would be correct as far as a collector would be concerned,,but I don't get in to that to avoid severe headaches and arguments.
The 94 carbine sight post WW2 was the common rifle style with a stepped elevator in a slot in the middle of the leaf of the sight. Pulling up the rear sight leaf allows the elevator to be moved in position forward or back raising or lowering the rear open sight leaf.
There are a couple minor variations of the carbine sight as well as of the post war elevator adj open rear sight.
Marlin used the same 'carbine' style rear sights on their 94, 93, ect lever action pre-war carbines. Changing over to the rifle style sight same as Winchester did after the War.
Those little carbine rear sights are about a $150+ item when you want to buy one to make your carbine 'right'. Perfect condition/blue can put them over the $200 mark.
