The main ways totell an SC stock from a Remington:
1) The "circle P" behind the trigger is usually 1/2" for an SC (vs. 7/16" on a Rem.)
2) One of the subinspector markings ahead of the trigger guard is usually in a diamond on an SC stock.
3) Look at the forward end of the inletted area for the lower band spring. It is rounded on a SC stock and "squared" on a Remington.