Of course that would be possible but for God's sake DON'T... that is a very nice shotgun. If you wish a field gun it would be MUCH wiser to sell the M12 trapgun and just buy a field gun... If just keeping the guns is a priority, perhaps a local smith could find and fit a M12 front end and install choke tubes. These can often be found at gunshows and even occasionally the auction sites and will preserve a nice old M12.. I assume of course the gun is original,, if not you would most likely still want to keep it as is... If it is stocked to normal trap dimensions (long-straight) it will not prove a very satisfactory field gun in any case.. Better to keep the old sweetheart as is and go find a good used 870. Usually only a bit over $200 at local gunshows.. Good luck from the gunnut69