andi makes a good point. I wasn't trying to say you don't have an original carbine, its just that the s/n looks like it was in the range of rifles per my reference books; however, there is new evidence coming to light regarding Kragicon's. There's a guy over on the Joustericon forum that goes by 5MadFarmers as well as Dick Hosmericon that can probably tell you a lot more about this rifle. 5MF has some very interesting research work going on in the area of Krag's that is worth reading.