The Solar Energy Bazooka

A grey bazooka that folds down for carrying and opens out for use, with heat vision built into the sight. It runs on the sun, builds up a charge from it, and overpowers the Bounty Hunter when it fires.

Stargazer first used it against him two hundred years before the series starts, and again on Hanging Rock to get the squadron out. It holds a little charge sitting in the office, and it comes out once more when the Super Sky-Shadow hits Hawk Haven.

The Bounty Hunter eventually works out the weakness. On his next return he leads Stargazer into a cave with no sunlight in it, which is the smartest thing any villain in this series does.