Bi-gun

	Bi-gun
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Pattern type	Gun
Number of cells	44
Bounding box	56 × 17
Period	46
Barrels	2
Discovered by	Bill Gosper
Year of discovery	Unknown
Rules
Outer-totalistic rules	B3/S23 – B38/S23
# of rules	21 = 2
Isotropic rules	B3/S23-k – B34e6c8/S234c5k6-ak7e
Glider synthesis
Fewest gliders	10
Catagolue-generated RLE	synthesis
Uploaded synthesis RLE	bigun_synth.rle
Pattern files
Plaintext	bigun.cells
RLE	bigun.rle
Identifiers
apgcode	yl46_1_10_ace82e6a60e972a3a224b998d5e29b17

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.

References

↑ Alan Hensel's lifebc.zip pattern collection.
↑ dani (February 12, 2022). Re: Soup search results (discussion thread) at the ConwayLife.com forums