AR-15/AR-10 Gas Block Roll Pin Tool

Geissele Gas Block Roll Pin Tool

The hole at the tip of the gas block roll pin tool is sized so that the roll pin must first be pressed into the tool (the roll pin does not simply slide in). Place the set pin on a hard surface and tap the tool against the pin to seat it in the tool. When the hole in the gas block engages the set pin, the pin is compressed enough that the tool can be removed from the set pin. After that, a single tap with a center punch is all it takes to set the set pin into the gas block.