| WRA | Aperature | B8868-1 | Type 2 | January/1945 to June/1945 | 1600000 - 1640000 | WIN13 series. Same as Type 1 with exception to tracks cut on either side of teeth. |
| WRA | Elevating Pinion | N/A | Type 1 | December/1940 to January/1943 | 100101 - 1280000 | Short with 6-40NF thread, with flush nut. Early examples (to circa 46,000-47,00) were marked inside with the part number. |
| WRA | Elevating Pinion | N/A | Type 3 | January/1943 to June/1945 | 1280000 - 2540999 | Long with 8-36 NF thread, with locking bar. |
| WRA | Elevation Knob | N/A | Type 1A | December/1940 to June/1945 | 100101 - 1240000 | Checkered rim, early closed arrowheads. Later open arrowheads more common. |
| WRA | Elevation Knob | N/A | Type 1C | September/1942 to June/1945 | 1240001 - 2540999 | Knurled rim, open arrowheads |
| WRA | Front Site | B147427 | Type 3B | December/1940 to June/1945 | 100101 - 2540999 | 0.812 inches wide at blades. Punch marked. |
| WRA | Front Site Screw | N/A | Type 2 | December/1940 to June/1945 | 100101 - 1300000 | Rebated Allen socket head, used with seal. |
| WRA | Front Site Screw | N/A | Type 3 | March/1943 to June/1945 | 1300001 - 2540999 | Non-rebated head. Head may be smooth or knurled. |
| WRA | Rear Sight Base | C46001 | Type 1B | December/1940 to June/1945 | 100101 - 2540999 | Some bases circa serial# 165,000 may have "CM" marking. |
| WRA | Rear Sight Cover | B8872 | Type 1 | December/1940 to August/1941 | 100101 - 116000 | Similar to Type 1D SA. No markings, thinner spring steel. Early ones may be blued, most were light gray-green parkerized. |
| WRA | Rear Sight Cover | B8872 | Type 2 | August/1941 to June/1945 | 116000 - 2540999 | Similar to Type 2 SA. Thinner spring steel, light gray-green parkerizing. |
| WRA | Rear Sight Lock Nut | N/A | Type 1 | December/1940 to April/1943 | 100101 - 1310000 | Flush nut, short pinion, 6-40NF thread. Also, locking bar rounded ends match curve of knob, no beveled top surface |
| WRA | Rear Sight Lock Nut | N/A | Type 2B | April/1943 to June/1945 | 1310000 - 2533060 | Locking bar, long pinion, 8-36NF thread, locking bar rounded ends match curve of knob. |