If you're talking about the Williams peep that goes on the bridge, no, you don't have to do any tapping. It secures to the bridge with a set screw just like the earlier A3's. The part number/model is WGRS. Here's one listed on fleabay;
Williams WGRS Receiver Peep Sight 03 A3 1903 A3 Springfield | eBay
I have one and they work well other than you may be restricted in disc size due to clearance on the sight itself.
KurtInformation
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