Period-43 glider gun is a true period 43 glider gun discovered by Nico Brown on September 11, 2022. It uses the same honey farm + fishhook → glider reaction that many other glider guns do. It was originally found in a form using a block and eater instead of the catalyst, but the block got turned into a pond rather than actually being restored, so Bellman was used to complete it.
This is the only known period-43 gun, and oscillators based on this gun are the only known period-43 oscillators that don't use the Snark. The form of the gun capped with fishhooks is the smallest known period-43 oscillator by population, with 80 cells.
When the gun was discovered, it was tied for the seventh smallest by bounding box.
A 30-glider synthesis of the gun was found early the next day.