I picked this up for one of my ARs. Has anyone else noticed how stiff the hood is that covers the fiber optic element?

I know its new and tight, but sometimes I'm a bit concerned about how much force it takes to close it.

BTW, I'm assuming the fiber optic is photo-luminescent? It glows and night and I seriously doubt it's the tritium element in the optic. I suppose I could be wrong though.