They refer to the smaller guage and shorter nails here as cheaters. Our code calls for a full length 3 1/4″ inch nail and you can find them to fit your gun. Codes vary so check around.
My Dad was an old hand nailer kinda guy. He called his nails cheaters as well. He would take a box of 16d common hand drives and soak them with a solution of pariffin wax and gasoline. Made them slick and quick to drive. I don’t think those would have been code either