Originally Posted by willfully armed
They aren't roll pins. They are drift pins. They are also tapered. Yes you can reuse them.
Some companies use tapered drift pins, some use straight drift pins. My DPMS had tapered pins. My LMT had straight pins. I misplaced one of the pins on my LMT, I used a roll pin in its place. I talked to a 'smith about this issue, he agreed that a roll pin will work fine in place of a straight drift pin, said he had installed many roll pins on pinned gas blocks without any issues.