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x = 50, y = 15, rule = B3/S23 11bo$10b2o$9b2o$10b2o2b2o$38bo$38b2o8b2o$39b2o7b2o$10b2o2b2o18b2o2b2o$ 2o7b2o$2o8b2o$11bo$34b2o2b2o$39b2o$38b2o$38bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]]
Pattern type Gun
Number of cells 44
Bounding box 56 × 17
Period 46
Barrels 2
Discovered by Bill Gosper
Year of discovery Unknown

The bi-gun is a double-barreled glider gun that was found by Bill Gosper in the early 1970s.[1] Much like his Gosper glider gun works by colliding two queen bee shuttles together, the bi-gun works by colliding two twin bees shuttles together. Dietrich Leithner discovered that it can be synthesised with 12 gliders.

This gun appeared semi-naturally on February 12, 2022, in a symmetric soup submitted to Catagolue by Charity Engine.[2] This makes it the second unique gun to have occurred in a soup, after the period-156 glider gun.


  1. Alan Hensel's pattern collection.
  2. dani (February 12, 2022). Re: Soup search results (discussion thread) at the forums

External links