IBM | Barrel | Type 1 | Unmarked | 3651520 - 4000999 | Marked "I.B.M. CORP." and date marked until December, 1943. |
IBM | Bolt | Type 3 | AOB, EM-B, Bx, SB | 3900000 - 4000999 | Round bolt. Bx, x = numeric digit(s). |
IBM | Extractor Spring & Plunger | Type 3 | Unmarked | 3651520 - 4000999 | |
IBM | Firing Pin | Type 1 | BEB, BR-B, BTB, OBB, OB-B, SVB, WB, Underlined WB | 3651520 - 3799999 | |
IBM | Firing Pin | Type 3 | BEB, BTB, OBB, OB-B, SVB, Underlined WB | 3800000 - 4000999 | |
IBM | M.C. / Safety Spring & Plunger | Type 1 | Unmarked | 3651520 - 4000999 | |
IBM | Operating Slide Stop Spring | N/A | Unmarked | 3651520 - 4000999 | |
IBM | Rear Sight | Type 1 | S | 3651520 - 3963999 | Right base marked "IN-B", "WB", "FOB", "TN" or unmarked. Leaf marked "TN" or unmarked. |
IBM | Recoil Plate Escutcheon Nut | Type 1 | Unmarked | 3651520 - 4000999 | Early production. |
IBM | Recoil Plate Escutcheon Nut | Type 2 | Unmarked | 3651520 - 4000999 | Late production. |
IBM | Stock | Type 3 | BR-B, JL-B, LW-B, Sc-B, TN | 3890000 - 4000999 | |