This billet lower didn't make use of a set screw for the bolt catch?
For the bolt catch roll pin, you'll need a 3/32 Roll Pin Punch like this one
Grace USA makes. A "roll pin punch" has a tip on the end of the punch to keep the hollow portion of the roll pin from deforming as it is tapped in/out (a "pin punch" does not have this feature).
Use masking tape to cover up the portion of the lower receiver, that is next to the bolt catch ear the roll pin goes through, that is on the pistol grip side of the lower receiver. If you are not steady enough not to mark or gouge up your lower while tapping out the roll pin. Use a small brass hammer such as a jeweler's hammer to tap the punch, and as you tap push the punch into the roll pin (as if you are trying to push the roll pin through) to minimize the roll pin acting like an air-chisel when the hammer makes contact with the punch.
When re-installing the roll pin, tap it back in from the side that was taped up. Use whatever gun oil you use to lubricate the roll pin (makes installing roll pins easier), and the holes in each ear the roll pin goes through. While at it, lubricate the bolt catch plunger and plunger spring as well. While tapping the roll pin through, push the punch into the pin as before. Also, using another punch to line up the bolt catch with the ears helps. As the roll pin goes into place it will gradually push the punch acting as a guide pin out.