That's not a fake Krag it's just not in it's correct military configuration. That is very common. Krags were sold cheap on the surplus market and many we're modified or sporterized if you will. That Krag you bought if it shoots good it's worth what you paid. The barrel was likely changed or shortened. It was common to install a front sight like that when a barrel was modified. When people refer to fakes they mean someone is selling a Krag as something it's not. Like representing a rifle as a carbine when it was not a carbine. What you bought is a Krag but it's not as it was when it was made. If you like it shoot it and dont fret.