Springfield 87A peep sight

Getting old. Eye not what they used to be.

Have a Springfield 87A that shoots great.
Even with the terrible trigger.

It has no holes drilled for anything.
I'm wondering if there is a peep sight that might work on it????.
I would rather not drill it if possible.

I have a williams fp that is for the 87 so they were available - It does require drilled/tapped holes though --
It looks like a fit for my old savage or mossberg as well - perhaps any round receiver --