Anyone know if the FS on the 64-5 is pinned?

I have a 3" and can't find a pin in the rib. I can see it on my 64-3.

I'd like to replace the ramp with a higher-visibility post. The gun's already modified, so it's not going to hurt anything.

IIRC, the -5 was introduced 1991.

I can see the pin on my 64-3. I have also noticed that some model 10's can have a pinned front sight and some have the sight integral to the barrel.
Have never seen a model 64-5, so can't comment on the front sight.