FCD - Gas Block Pin Tool GPT - Gas Tube Install
This guide details the process of installing an AR-15 gas tube into a gas block using specialized tools like the Forward Controls Design Gas Block Pin Tool (GPT) and Geissele punches. The FCD GPT ensures the gas block remains stable, allowing for precise alignment of the gas tube and the roll pin holes. The process involves starting the roll pin with a starter punch and then fully driving it with a 1/16th punch, ensuring it is centered and flush for a secure installation.










