Just picked up a B9R and swapped out everything I wanted to other than the sights. I’ve read some older info saying that the sights are Novak-ish footprint but aftermarket stuff takes some more fitting than normal. Is this still true or am I good to pickup any Novak footprint set?

I swapped in a Novak style front sight on a Tisas and it did require some fitting and the retainer pin did not line up.  I went with tight fit and lock tite.

I do have an aftermarket rear sight that came off my Tisas...