If it were my inherited M12- full choke- I'd shoot spreader loads. Interchanging barrels on any M12 is not the same as with a Remington 870 or Ithaca 37. If you ever wanted to sell or trade that M12, it will be worth waaaaay more than if you alter it in any way, shape or form. To cut down the barrel to "open the choke" is about like having a frontal lobotomy to cure prostate problems.. RWTF

"The field is the touchstone of the man"..