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SA Rear Sight Usage
Rear Sight Short Pinion Flush Nut
Checkered Windage/ Checkered
Elevation
Used from start of production to 200,000.
Rear Sight Short Pinion Flush Nut
Knurled Windage/ Checkered
Elevation
Used from about s/n 200,000 to 500,000.
Rear Sight Short Pinion Rounded Lock Bar
Knurled Windage/ Checkered
Elevation
Used from about s/n 500,000 to 1,009,000.
Rear Sight Long Pinion Rounded Lock Bar
Knurled Windage/
Knurled Elevation
Used from about s/n 1,009,000 to 2,700,000.
Rear Sight Long Pinion Square Lock Bar
Knurled
Windage/ Knurled Elevation
Used from about s/n 2,700,000 to 3,900,000.
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