FansProject first teased their Function-X line of toys at TFcon 2012, where art of Sigma L was seen.
Sigma L was released in October 2014.
Reprolabels released stickers for Sigma L in February 2015.
Sigma L and UUUU are mentioned in the biography for MADLAW.
Sigma L appears in the battle scene on the back of Tusker and Megazero's boxes, where he is fighting along side Quadruple U, Shadow Scythe and Shadow Commander.
- FansProject Function-X4 Sigma-L (2014)
- Reprolabels Sigma L (2015)
- A set of stickers for Sigma L.
- Charles Shelton (September 15th, 2014). "TransMissions". http://www.transmissionspodcast.com/ (Podcast). TransMissions. http://www.transmissionspodcast.com/2014/09/transmissions-episode-67/.
- Chris and Ash (October 8th, 2014). "Star To Star Toys News". https://www.youtube.com/channel/UC6PGk5W0pSKfwbXpIahKObw (Podcast). Star To Star Toy News. https://www.youtube.com/watch?v=FsyjaCR4Im4.
- "FPJ PX-04". Chi Soul Die (模魂志): p. 102-103. November 2014.
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