To the best of my knowledge, it's illegal.Well, that's not unsafe at all.
That search string turns up several videos, including two that are 27 minutes long and one that's 26. However, by pointing me to the exact spot in the video, I was able to see what you were talking about.MICHAEL BELL
FRANKLIN ARMORY VS ECHO BENCH REVIEW
[QUObbenenglish, post: 1702461, member: 10792"]A binary trigger that has no way, other than what ScS outlined, to stop the second round from discharging produces a situation where, in normal use, one pull of the trigger *will* inevitably produce two shots. AFAIK, ATF considers that to be a two-round burst trigger and illegal.
Why would you ever not want to fire the second shot.