There is no way to tell for sure without trying on a gun. K and N both look the same. It’s a wild guess but the bottom set looks smaller than the top set so I’d guess one set of K and one set of N but that could be the camera angle
They look like Ks to me, but @Etruett is right - only way to be sure is to have a gun to try them on or a set of each to compare.
K frames swoop in at the top more than Ns do. Camera angle might be making them look more swoops than they really are, but that is why I say they look like Ks.
