Other SW I've owned which was mainly semi's had dirty barrel, but When I got my new model 60, I was looking in the box to see when the revolver was test fired and there wasn't spent casing in the box. I called SW and the rep said they aren't required anymore to test fire revolvers so that's why there's no spent casing. I asked him how did they know the revolver fired and there was nothing wrong with the firing pin or anything else? All I heard was crickets, I said Thank You! then hung up phone!