Described as an “electromechanical trigger, similar to those found on auto-loading firearms in Olympic competition,” the Electronic Arms eTrigger Adjustable Electronic Trigger System is a replacement for the stock system on a Ruger 10/22.
The system is user adjustable and is powered by a single 9 volt battery. The unit is not small, and from the photos, it appears to be about the size of an M14 magazine. The eTrigger sells for $450 on ebay.
On their Facebook page, the company is also showing a prototype of a second generation eTrigger in a bullpup-configured rifle.
Thanks to Cymond for the tip.Related