Maybe the stock lugs were used during shipment to the military on racks to prevent damage or while they were in storage before being issued.It seems to me as a machinist to be a lot of wasted time to machine the stock lug that was rarely used with a stock.It really would be of little help in setting up the frame for a machining operation as it would not be rigid enough or accurate enough for setting up a machining operation without additional clamps or fixtures.
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