I got two of'em and only the TAC trigger I bought ever worked worth a damn,
The other,"Hell FIre Trigger attatchment", that I bought was the,"Tri burst", total garbage... I bought both mine with the exact idea of getting legal pseudo full auto fire for some grins, I mean for 29.00 I ddn't expect too much. Boy was I still disappointed
. The TAC trigger adds a second trigger(in front of the other) that is fired by forward preassure as you release the,"normal" trigger, giving you a double tap. With a light trigger, I bet you could get a TAC trigger attatchment to hummmmm right along". You get two shots if you do it correctly. For 29.99+sh, I got a sheet metal band, a screw-on aluminum block to act as a fulcrum for the front trigger, and the lever(trigger) itself.
The TAC trigger will simulate full auto on my AR-15. I have to get it PERFECTLY installed, but if I do, I get a simulated full auto burst by barely squeezing the,"normal" trigger just past it's breaking point. The best burst I have gotten was a 5-6 shot burst, but they all eventually end the same. The hammer,"locks up tight", against the firing pin's shoulder(which is a good thing as it might go boom if it didn't
). I then have to recock the hammer while locking the bolt open and making sure nothing is left in the chamber(once a round was thrust from the mag into the chamber before everything locked up). When I get the bug, I do fire it every now and then, but the time I spend getting it perfect, and I mean PERFECT,+ the time I have to spend clearing stoppages, almost make it not worth it. But I see it as saving me money because if I had a real full auto, I would be broke(ummm, more broke).
PS- You shoulda seen my grin after that first burst of three shot forth from the barrel,it was probably worth the 29 bucks alone...Oh yeah it works from the shoulder if installed correctly but still won't burp more than 5-6