Set up for M2, Side selector lever cut and no forward bridge
M1stock, Wood Bridge Intact,
Having a LONG barrel channel.. you might have a M2 stock.
Could be a SA Springfield stock. If a SA, Look for SA stamped on the top edge near the barrel channel you just measured.
If a M2, The Side profile will have a 'Potbelly look' something like one of these versions below:
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