As Arc Angel says, be careful with the component edges.... or, at least, be very careful to not round them.
If the edges of the trigger bar and/or the connector (where they meet) are rounded too much, the bar will drop downward at the time of trigger reset (instead of the bar moving only sideways as designed). This can cause the "sear" of the bar to move down away from the "nose" (or "lug") of the firing pin, releasing it. BANG!
If you have plenty of sear/nose engagement (2/3 or more recommended by Glock & as Butch's sketch in post #2 above shows), the chances of this are reduced - but if the overlap is not large, firing on release of the trigger can happen. Many of the Glocks I have owned have only had about 1/2 engagement... from the factory.
Last edited by Noponer; 10-07-2012 at 21:27..