[
does it require drilling?]
And tapping, too.
In fact, IIRC the issue sight "ears' will have to be ground off the receiver bridge, for the peep to fit (it's a side mount).
Williams recommends that the bridge be ground to the same contour as the front receiver ring.
The Williams peeps ( both FP & 5D) attach to the RH side of the receiver bridge, just ahead of the closed bolt handle.
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