It's possible to bend if not careful
Apparently milled wrong!
Well here's the scoop. I bought this trigger even after reading the other three reviews present here at the time. Guess what? It turns out I have the exact same problem as the other two guys.
HOWEVER a big part of their issue with this trigger is that they diagnosed the problem wrong! First of all, do not file any parts you are re-using from your stock trigger, so if anything goes wrong, you can always go back. In fact, I don't think you need to file or even drill this trigger at all to get it working.
The symptom my a-5 had was that you would have to manually push the trigger forward for the trigger to re-engage so you could shoot after firing.
After installing the trigger the first time I took it outside and my gun shot once but then the trigger would just go *click *click *click even though it was cocked.
I took it apart, and after about half an hour of carefully examining the difference between the stock trigger and the assasin I figured out the most important flaw.
There is a small rectangular slide of metal with a spring in the middle of the trigger that touches the black firing pin. This rectangular piece of metal must be low enough so that when the gun is cocked that the black firing pin is above it so when you pull the trigger the pin gets pushed upward, causing the bolt to be released so the gun fires. The trigger has been milled so that that rectangular piece is loose, and sits too high.
What I did, is I found a thin piece of sturdy paper (a very thin sheet of metal or something harder would be better) and I wedged it above the rectangular piece of metal so that it is forced downward slightly, possibly only a 1 or 2 mm difference! This did the trick, and I'm keeping my eyes open for a thin and strong washer or piece of metal to replace it with sometime...
I just hope I save someone else from experiencing a head-ache with this POORLY designed, but good looking and functional trigger.
Looks freaking sweet!
Made of somewhat soft aluminum, not steel or anything, so be careful you dont bump it hard, or hold the gun by the trigger guard or you might bend or even snap the metal.
The plastic stock trigger is probably a little tougher.
Works good if you fix the manufacturer defect which seems to be common.
I enjoy using this trigger now, but who knows if it will mess up someday when I'm fighting in a game...
My advice? Bring your stock trigger along when you go paintballing just in case.