Set up for M2, Side selector lever cut and no forward bridge



M1icon stock, 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: