PRi AR15 gas block with roll pin starter was designed for installing the gas tube and inserting the roll pin into the gas block. The block holds the gas block to allow the roll pin starter punch to start the roll pin.
Gas Block Fixture with Roll Pin Starter
Gas Block Fixture with Roll Pin Starter Punch AR-15, AR-10 - ACME
AT3 Low Profile Steel Gas Block Gas Tube Roll Pin Combo
Roll pin starter punch
Gas Block Fixture with Roll Pin Starter Punch AR-15, AR-10
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GPT (Gas tube Pin Tool)-GPT
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Little Crow Gunworks AR-15 Gas Block Installation Tool Kit