Lock bar clarification confusion

[Rick Cummelin]

I see only Type II sights described with having rounded bars and Only Type III sights described with square bars. Do the type II have only short pinions and Type III have only long pinions? If so there are 2 types of Type III, square and round.

I'm confused as to what I need to do. Do I need to change just to lock bar to make it correct?

Only the T1 lockbar works with the short pinion. The T2 & T3 lockbars work with all long pinions.

All you need to do is swap the T3 lockbar on your rifle for a T2 to make the rear sight correct.