This is an ORIGINAL action slide for an early 1st variation Winchester Model 12 that fits the 12 gauge shotgun.this action slide for the 18 groove corn cub style , lenght of action tube is 6 7/8 inch long .
Note: The action slide Bar on the Early Mod 12 stops at the flange, on the LATE Mod 12 the action bar extends about an 1 1/4 past the flang.