Donnie that is a Slabside Barrel. The same barrel as a bull barrel with the sides milled off. The reason for this is to balance the gun better and lighten it a little. The bull barreled ones are about a hundred dollars cheaper but shoot just as good. I have a few Rugers with the slab side barrels in 6 /78 inches. That is a very nice gun you have there and the Rugers are a little difficult to take down until you learn the tricks and get used to them. My wife also loves to shoot the Rugers in 22LR. I recently just got a Sig 1911 22 and it sort of looks like shes eying that one too. I dont care as long as I can keep her interested in shooting.