The Tac-Con trigger.
Tac-Con Trigger 1
The Tac-Con trigger does let you shoot fast, but I'm still undecided if that's because of the sear, or if it's just a really good single stage trigger. Two magazines doesn't really give you a good feel for what it's all about.
Tac-Con Trigger 2
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I couldn't get this thing to run as fast as some of the other folks I saw at the line but I'm sure I did better than I would have last year in the 0 Kelvin temperatures. I bet with practice, one could get it going pretty quick.
It was a nice trigger, to be sure, but I think they might be over-hyping it a bit. The "
Man, this thing is fast. It even comes with an ATF letter saying it isn't an NFA item" line just felt like a solid marketing ploy - it's not shocking that the ATF FTB found that the Tac-Con trigger doesn't turn a semi-auto AR into a machine gun.
The third mode provides "positive reset" of the trigger so that by the time the bolt is finished cycling, the trigger is reset for another short 4.5# match grade semi-auto shot, letting you rattle off shots as quickly as you can move your trigger and as accurately as your rifle and your abilities will allow. The guy their range day shooting bay described it as "instead of increasing the cycle time of the action, they reduce the cycle time of the trigger."
[youtube]http://www.youtube.com/watch?v=EM4GzrtZo7A[/youtube]
http://www.youtube.com/watch?v=EM4GzrtZo7A