trigger house modifications

[wtmr]

anyone know why the two modifications done to this trigger house? ebay 190636575562 someone can post a link that remembers how-you have to look past the early parts in it to see the mods, one is in side in front of hammer strike area and other thru back of trigger guard--was this a bubba automatic of some kind missing a couple pieces?

WWII M1 Carbine Trigger Housing Complete Marked Q-NL | eBay

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