I'm looking to remove the bottom sling loop from my FSB, as seen in this image (not mine);

Seen here, is a pic I snapped of it;

It's not a standard roll pin. It doesn't seem to budge as I try and bang it out with a punch and hammer. What type of fastener is this, and what would be the best method of taking it out?

Seen here, is a pic I snapped of it;

It's not a standard roll pin. It doesn't seem to budge as I try and bang it out with a punch and hammer. What type of fastener is this, and what would be the best method of taking it out?

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