Where can I find bang stick blueprints?

As of 2014, it is difficult to find blueprints specific to bang sticks on the Internet. However, there are websites where parts and general design notes are listed out, such as BudsBangSticks.com.

A bang stick is designed for protection for scuba divers and deep-sea divers. The typical bang stick carried by scuba divers is a powerhead that is mounted on a wooden or metal pole. The bang stick is specifically designed to work against underwater threats and causes damage through high-pressure gas from the muzzle blast rather than the kinetic energy generated by the bullet. Ammo used in a bang stick should be treated before diving and should not have aluminium casings.