The trigger housing part number is 7267030. Following it will be the manufacturer. USGI are SA, HR-N, OM-N, 66118 or TRW. I'm not sure how the DPMS ones were marked. Their CAGE Code is 40554. Commercial SAI housings will usually have a dash and letter after the part number. I, O, G, etc.
Commercial hammers are unmarked. USGI can have any one of dozens of combinations, since M1 Garand hammers are included.
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