J.B.Patton,
Check the links above, posted by Raimey. In the one with the 410, note the top of the action on the side, has a screw showing. This indicates that it has hanging, interrupting, sears. Then note that on the sideplated 12 ga. you can't see such a screw. However, the sideplate is high enough that it could hide the screw, if it also has hanging sears. To know for sure, remove the sideplate( use well fitting screwdrivers and be careful of splitting off wood around the sideplate).
Mike