Winchester 1886 rear sights|Winchester Rifles|Forum|Winchester Collector

Hi everyone,

I wonder what different rear sights were used (which numbers?) for the 1886 model and why.

I am aware that out of the box the 45-70 used the ladder rear sight (similar to the carbine sight) the 50-100-450 used a three leaf express sight – the rest buckhorns. Does anybody know which numbers they were? 

And why did they use different sights in the first place? 45-70 has a high trajectory as well as the 50-100-450- so why use a different sight with less adaptability for the 50? 

Thank you for your thoughts