USCARBINECAL30M1.com M1 Carbine Components Listing by Part Group
* All dates and serial numbers are approximate *
USCARBINECAL30M1.com M1 Carbine Components List
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| STDP | Operating Slide Stop | Type 2 | Unmarked | 1982520 - 2352519 | |
| STDP | Operating Slide Stop Spring | N/A | Unmarked | 1982520 - 2352519 | |
| STDP | Receiver | N/A | N/A | 1982520 - 2352519 | |
| UEF | Barrel | Type 1 | Unmarked | 1350000 - 6199688 | Marked "UNDERWOOD". All were date marked. |
| UEF | Gas Piston | N/A | Unmarked | 1350000 - 6199688 | |
| UEF | Gas Piston Nut | Type 1 | Unmarked | 1350000 - 2352519 | |
| UEF | Gas Piston Nut | Type 2 | Unmarked | 2352520 - 6199688 | |
| UEF | Operating Slide | Type 2 | Circled OU, Circled ".U.", ".U." | 1350000 - 4049999 | May also be marked with Ordnance Flaming Bomb. |
| UEF | Operating Slide | Type 3 | Circled "O.U.", Circled ".U.", Hearted F w/ ".U.", | 2352520 - 6099688 | May also be marked with Ordnance Flaming Bomb. |
| UEF | Operating Slide | Type 5 | W w/Underlined U, Circled "O.U." | 6099689 - 6199688 | |
| UEF | Operating Slide Spring | N/A | Unmarked | 1350000 - 6199688 | |
| UEF | Operating Slide Stop | Type 2 | Unmarked | 1350000 - 6199688 | |
| UEF | Operating Slide Stop Spring | N/A | Unmarked | 1350000 - 6199688 | |
| UEF | Receiver | N/A | N/A | 1350000 - 6199688 | |
| WRA | Barrel | Type 1 | Unmarked | 1000000 - 7369669 | Early marked "WRA" and dated, late marked "WRA" or "W", not date marked. |
| WRA | Gas Piston | N/A | Unmarked | 1000000 - 7369669 | |
| WRA | Gas Piston Nut | Type 1 | Unmarked | 1000000 - 1159999 | |
| WRA | Gas Piston Nut | Type 2 | Unmarked | 1160000 - 7369669 | |
| WRA | Gas Piston Nut | Type 3 | WS, W | 1280000 - 7279999 | |
| WRA | Operating Slide | Type 1 | O, W | 1000000 - 1109999 | |
| WRA | Operating Slide | Type 3 | W | 1110000 - 1249999 | |
| WRA | Operating Slide | Type 4 | W | 1250000 - 5579999 | |
| WRA | Operating Slide | Type 5 | W, W w/Part # | 5580000 - 7234999 | |
| WRA | Operating Slide | Type 6 | W w/Part # | 7235000 - 7369669 | |
| WRA | Operating Slide Spring | N/A | Unmarked | 1000000 - 7369669 | |
| WRA | Operating Slide Spring Guide | Type 1 | Unmarked | 1000000 - 1067499 | |
| WRA | Operating Slide Spring Guide | Type 2 | Unmarked | 1067500 - 7369669 | |
| WRA | Operating Slide Stop | Type 2 | Unmarked | 1000000 - 7369669 | |
| WRA | Operating Slide Stop | Type 3 | Unmarked | 1000000 - 7369669 | |
| WRA | Operating Slide Stop Spring | N/A | Unmarked | 1000000 - 7369669 | |
| WRA | Receiver | N/A | N/A | 1000000 - 7369669 | |