These are really crummy pictures because this K-22 isn't mine.....yet.

Can someone ID the front sight? It looks like there is an insert inside the normal front post. I've never seen one like it and several google searches have come up empty.

I'm guessing that this setup would cause the gun to shoot low unless the rear sight was regulated for the taller than normal front sight.

No serial number available but supposedly it was made in 1951.