The Geissele Gas Block Pin Punch set are made speccifically for the removal and installation of the 0.078" roll pin that secures the gas tube to the gas block on an AR-15/AR-308. Removal of a rusted in gas block roll pin has always been a challenge. The Geissele punch set make gas block work a whole lot easier.
AR-15, Issue:11, Page:089
Big Book Catalog, Issue:69, Page:087