So they are not factory made? I thought they were just a late model made just as the war war coming to an end.
That's the story the guys selling Tanker Garands made up to sell Tanker Garands.
The T26 was a shorter-barreled variant that was tested but never adopted. Most likely because it didn't work all that well. The term "Tanker Garand" was invented after the war as a gimmick.