M1 Garand Rear Sight Checkered Windage Knob WWII Lock Bar <br>Springfield SA<br>1939- April 1941 use<br> - NEW - MIL-STDM1 Garand Checkered Lock Bar Rear Sight Windage Knobs. These are new production parts with the Springfield SA style closed arrows and are checkered. Parts are parkerized to original MIL-STD-171 park finish (Mang Phos). These will be darker than the lighter Zinc Phos park finish, see last picture for comparison of colors, right one is Zinc Phos, left one is what these are - MIL-STD-171 park per drawings. Checkered Windage Knobs are appropriate for Springfield M1's using flush nut from start of production to about 228,000 serial number range (thru Apr '41).