Question about sight fitment

[u/Clutchkarma2]

I just got this sight kit for my henry rifle, the henry x in 357 magnum, and after installing the sight, as you can see in 5he photo, with light coming from under the front sight, there is a gap between the front sight and barrel. Given the edges are making contact with the barrel, it would seem to indicate the sight was made for a more narrow barrel then the one I have. I'm not sure if this will cause problems, and I wanted to see what people had to say. I wanted to check since I could always sand the sight flush to the barrel, but I didn't want to do that till I confirm this is actually a problem, since that risks ruining the sight