The Type 1 lock bar was a replacement for the early "flush nut" on the windage knob, being easier to do adjustments and lock. Only the same problem continued as with the flush nut - the lock bar could become loose and fall off ! This Type 1 came into service use in early 1942 but by 1943, the Type 2 lock bar replaced it. Winchester never used the Type 1 lock bar.

Original Type 1 lock bar rear sights are quite expensive now and fakers have made examples by altering the Type 2 lock bar.

I have two rifles, a early rebuild with a late '41 barrel and a June '42 rifle both with the Type 1 lock barAttachment 100078Attachment 100079Attachment 100080
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