Original Type III Rear Sight Lockbar for M1 Garand.
Manufactured by SA or WRA (Springfield / Winchester).
Very good condition!
Price is indicated for 1 piece.
90% of WW2-era produced M1 Garand had rear sight knobs with Lockbars.
The Lockbar was developed to replace the early Flush Nut type sight, and did not require the use of a tool to tighten and lock the rear sight in position.
There were 3 types of Lockbars developed during WW2. The first variants (Type I & Type II) had rounded edges. The third variant (Type III) simplified the Lockbar by eliminating the curved ends as an expedient to production.